Booking option: Private tour with an official Suomenlinna guide, free cancellation up to 24 hours before. Book this Compare options below
Suomenlinna is a district of Helsinki and a sea fortress open every day of the year. There is no entry fee for the island: you pay for the ferry or waterbus and for any museums you wish to visit. Everything else, the ramparts, cannons, Great Courtyard, dry dock and King's Gate, is free to explore. The fortress is built across six islands, and the visitor route passes through them.
This guide covers what’s worth seeing in Suomenlinna, in what order and how much time it takes. If you haven’t yet checked how to get to the island, read the guide to the Suomenlinna ferryfirst. Museums are covered in more detail in the guide Suomenlinna museums.
Short answer
Walk the Blue Route from the main pier to the King's Gate: along the way you’ll see the church, whose dome serves as a lighthouse, the Great Courtyard and Ehrensvärd’s tomb, the dry dock, the ramparts of Kustaanmiekka and the King's Gate. The route itself takes about 30 - 45 minutes, but you should allow at least 1 - 1.5 hours for the whole visit, and with a museum or a longer break, half a day. There is no entry fee for the island.
What should you see in Suomenlinna?
The main attractions along the Blue Route are the church-lighthouse, the Great Courtyard, the dry dock, Kustaanmiekka and the King's Gate. The island also has five museums, one of which is the submarine Vesikko.
Suomenlinna’s attractions are mainly buildings, ramparts and landscapes rather than individual indoor sites. This is why the island is best explored on foot, and the Blue Route is designed for this purpose: it runs from the main pier through the islands past the key sites to the King's Gate. The route includes the following:
- Suomenlinna Church, whose dome also functions as a working lighthouse.
- Great Courtyard and at its centre, the tomb of Augustin Ehrensvärd.
- Dry dock, the fortress’s shipyard area.
- Kustaanmiekka, the southern tip of the fortress with its ramparts, cannons and tunnels.
- King's Gate, a stone gate and pier on the shore of Kustaanmiekka.
There are five museums: the Suomenlinna Museum, the Ehrensvärd Museum, the Military Museum, the submarine Vesikko and the Customs Museum. They charge admission and have their own opening hours.
How much time should you spend in Suomenlinna?
The Blue Route from the main pier to the King's Gate takes about 30 - 45 minutes. For the whole visit, allow at least 1 - 1.5 hours, and with a museum, tunnel and café, easily half a day.
According to suomenlinna.fi, walking from the main pier to the King's Gate takes about 30 - 45 minutes and the whole visit at least 1 - 1.5 hours. The difference comes from stops: climbing the ramparts, taking photos, passing the church and lingering at the King's Gate take more time than the walk itself. Add to this the ferry journey, which takes about 15 minutes each way.
If you want to visit the Suomenlinna Museum and its 25-minute widescreen film, explore Vesikko in summer, eat on the island or swim by the shore, set aside an afternoon. A relaxed day is easy to arrange on the island, as the HSL ferry runs year-round from early morning until the small hours, with the last ferry leaving Suomenlinna at around 2:00 am.
One and a half hours with an official Suomenlinna guide for your own group: tunnels, cannons, fortifications and the dry dock.
Book thisWhat is the lighthouse of Suomenlinna Church?
Suomenlinna Church was built in 1854 as an Orthodox garrison church, and since 1929 its dome has also served as a lighthouse. The light flashes the Morse code letter H, the symbol of Helsinki.
The church is one of the first stops on the Blue Route. Completed in 1854 as an Orthodox garrison church, it has been Lutheran since 1918; the onion domes were removed at that time. Since 1929, the church’s dome has functioned as an active lighthouse, flashing the Morse code letter H as the mark of Helsinki.
The church interior is a June - August attraction, and like museums, the church has its own access policies. The building and lighthouse dome are visible from outside year-round. More on the history of the church and fortress is covered in the guide Suomenlinna history.
What can you see at the Great Courtyard and dry dock?
The Great Courtyard is home to the grave of the fortress’s builder, Augustin Ehrensvärd, and the dry dock is the next stop on the route. Both are along the Blue Route.
The Great Courtyard is the heart of Suomenlinna. The construction of the fortress was led by artillery officer Augustin Ehrensvärd, and his grave lies in the centre of the courtyard. It’s a natural place to pause for a moment. The foundation stone of the fortress was laid on Susisaari in 1748, and construction took about sixty years.
The dry dock is another stop along the route worth pausing at. Both sites are also included in the Helsinki and Suomenlinna tour, whose listing says the walk on the island goes past the barracks, the Great Courtyard and Ehrensvärd’s tomb. The tour lasts 5.5 hours and includes hotel pick-up and a return ferry to Suomenlinna.
Olympic Stadium, Sibelius Monument and Uspenski before the island, then the ferry to Suomenlinna and a walk to the Great Courtyard all on the same tour.
Book thisWhat is there at the King's Gate?
The King’s Gate is a stone gate and pier on the shore of Kustaanmiekka, built in 1753 - 1754. Its stone tablets bear Ehrensvärd’s text, urging posterity to stand on its own foundation.
King's Gate is the endpoint of the Blue Route in the southern part of Kustaanmiekka. Built in 1753 - 1754, it was named after King Adolf Fredrik, who landed here during an inspection visit. Ehrensvärd designed the gate’s stone tablets, the most famous of which advises posterity to stand on its own foundation and not rely on foreign help: "Eftervärld, stå här på egen botten och lita icke på främmande hjälp".
Kustaanmiekka is the southern tip of the fortress, where grassy ramparts and old cannons point out to sea. In summer, the FRS waterbus also stops at King's Gate, so you can start or end the route here. Note that the waterbus operates on its own tickets and HSL tickets are not valid; differences are explained in the guide ferry or waterbus.
Is there a castle or caves in Suomenlinna?
No actual castle or caves: Suomenlinna is a sea fortress, with tunnels built into its ramparts. The longest of these, the Rantavarustus tunnel at the tip of Kustaanmiekka, is just over 200 metres long and completely dark.
Many visit Suomenlinna expecting a castle, but suomenlinna.fi states it plainly: Suomenlinna is a sea fortress, so there is no actual castle. There are no caves either, but tunnels and vaulted casemates have been built into the fortifications, and visitors can enter some of them.
- Rantavarustus Tunnel At the tip of Kustaanmiekka is the island’s longest tunnel, just over 200 metres. It is completely dark, so bring a torch or use your phone light.
- Service Tunnel A tunnel runs from Kaivopuisto to Suomenlinna under the sea, but it is reserved for emergency, official and maintenance use and is not open to the public. Access to the island is by boat.
If you want to explore the tunnels with a guide, a private guided walking tour runs, according to the listing, through the tunnels, by the guns and ramparts and at the dry dock. The listing advises against the tour for those with claustrophobia, and it is not suitable for pushchairs or wheelchairs.
Official Suomenlinna guide, your own group and 1.5 hours in tunnels, cannons and ramparts; meet at the main pier under the blue-and-white umbrella.
Book thisIs it worth visiting a museum or Vesikko in Suomenlinna?
Yes, if you want the background to what you see on the route. The Suomenlinna Museum on the shore of Artillery Bay tells the island’s history from the 18th century to the present day, and the submarine Vesikko is open as a museum in summer.
Outside you see the fortress, but in the museums you understand it. Suomenlinna Museum day ticket takes you to the Suomenlinna Centre on the shore of Artillery Bay, where the exhibition spans from the 18th century to the present day. According to the listing, the museum shows a 25-minute widescreen film, the Suomenlinna Experience, every half hour in multiple languages, and the museum is accessible. Last entry is 30 minutes before closing.
The submarine Vesikko is Finland’s last surviving submarine and is a museum in summer. According to suomenlinna.fi, the Museum Card and Helsinki Card are valid for all Suomenlinna museums.
Suomenlinna Museum and a 25-minute Suomenlinna experience film on the same day ticket, accessible entry according to the listing.
Book thisHow to spend half a day in Suomenlinna?
Arrive by ferry at the main pier, walk the Blue Route past the church, the Great Courtyard and the dry dock to Kustaanmiekka, and stop at a museum or café along the way. Return the same route to the main pier and ferry.
The plan below is ideal for a first visit. All you need is an HSL AB ticket for the ferry, and the museum is optional. The ferry runs at least once an hour in winter and several times an hour in summer; check the day’s departures in the HSL Journey Planner.
Practicalities: restaurants, cafés and bars are open in summer and many year-round. Public toilets are available all year. There is no luggage storage or cash machine on the islands. You may eat packed lunches on a picnic, but lighting fires and barbecuing is prohibited everywhere on the islands at all times, including camping stoves. Dogs must be kept on a lead and are not allowed in playgrounds or on the beach.
| Stage | Destination | What to do there | Note |
|---|---|---|---|
| 1 | Market Square, HSL ferry | About 15-minute crossing to the main pier | AB ticket or Helsinki Card, ticket must be bought before boarding |
| 2 | Church | Lantern dome and exterior of the church | Indoor spaces June - August |
| 3 | Great Courtyard | Ehrensvärd's tomb and courtyard buildings | No entry fee |
| 4 | Suomenlinna Museum | Exhibition and 25-minute film | Paid entry, Museum Card and Helsinki Card accepted |
| 5 | Dry dock | Dockyard area along the Blue Route | No entry fee |
| 6 | Kustaanmiekka | Fortifications, cannons and Rantavarustus tunnel | Torch for the tunnel |
| 7 | King's Gate | Stone tablets and sea views | Waterbus stop in summer, own FRS tickets |
| 8 | Beach or café | Break before returning | Shore between Kustaanmiekka and Susisaari |
Frequently asked questions
Is there an entrance fee to Suomenlinna?
No. Suomenlinna is a district of Helsinki, open every day all year round, and there is no entrance fee. You pay for the ferry or waterbus and for any museums you enter.
How long does it take to explore Suomenlinna?
The Blue Route from the main pier to the King's Gate takes about 30 - 45 minutes. Allow at least 1 - 1.5 hours for the whole visit, and half a day if including the museum and café.
Can you barbecue or make a campfire in Suomenlinna?
No. Open fires and barbecuing are prohibited everywhere on the island all year round, including camping stoves. Picnics with packed food are allowed.
Is there a beach in Suomenlinna?
Yes. The official Helsinki city beach is between Kustaanmiekka and Susisaari. Dogs are not allowed on the beach.
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Free cancellation 24 hours before for every option. Trips are booked on GetYourGuide.
Private guided tour: tunnels, ramparts and dry dock
- Private guided walking tour with an official Suomenlinna UNESCO guide; language English or Russian
- Tunnels, cannons and fortifications, dry dock and boats and submarines built on the island, according to the listing
- Meeting at the main pier under the blue and white umbrella; ferry not included, HSL AB ticket is sufficient
Helsinki and Suomenlinna: city tour and ferry
- Local guide and driver; pickup from selected hotels
- Olympic Stadium, Sibelius Monument, Esplanadi, Old Market Hall and Uspenski Cathedral
- Return ferry to Suomenlinna and walking tour: barracks, Great Courtyard and Augustin Ehrensvärd’s tomb
Suomenlinna Museum ticket and Suomenlinna Experience film
The fortress history from the 18th century to today in one museum on the shore of Artillery Bay and a 25-minute widescreen film every half hour in many languages; a good start before the Blue Route
