UNESCO World Heritage sea fortress on an island off Helsinki. One of Finland's most popular attractions.

About Suomenlinna Sea Fortress

Suomenlinna ("Castle of Finland") is a UNESCO World Heritage maritime fortress built across six interconnected islands in Helsinki's harbor. Originally constructed by the Swedes in 1748 as Sveaborg ("Castle of Sweden") to defend against Russian expansion, it was captured by Russia in 1808 and later became Finnish when Finland gained independence in 1917.

Today, Suomenlinna is one of Finland's most visited attractions, home to about 800 permanent residents alongside museums, restaurants, an operational naval academy, a small brewery, and extensive fortification walls perfect for exploring. The Suomenlinna Museum, Toy Museum, Vesikko submarine, and King's Gate are highlights.

The fortress is reached by HSL city ferry from Market Square (Kauppatori) in 15 minutes, running year-round including through winter ice. The island experience combines military history, maritime atmosphere, rocky beaches, and panoramic views back toward Helsinki's skyline. Pack a picnic in summer—the ramparts are a favorite local spot for afternoon lounging.

Nearby Landmarks

Suomenlinna Fortress Vesikko Submarine King's Gate Suomenlinna Church dry dock

Transport Options

Taxi

Cost €35-€50 (to ferry terminal) + €5 ferry
Time 60-75 minutes (to terminal)

Follow "Taxi" signs at arrivals. Queue at official taxi stand. Metered fares, no need to negotiate.

Train (Ring Rail Line + HSL Ferry)

Cost €7
Time 70-80 minutes total
Frequency Ferry every 20-40 minutes

Step-by-Step Directions

Take Ring Rail Line to Helsinki Central, walk to Market Square (Kauppatori), take HSL ferry to Suomenlinna (15 min crossing).

Quick Comparison

Option Cost Time Best For
Taxi €35-€50 (to ferry terminal) + €5 ferry 60-75 minutes (to terminal) Convenience, groups, heavy luggage
Train €7 70-80 minutes total Budget, avoiding traffic

Good to Know

Late Night Transport

The Suomenlinna ferry runs until approximately 11:30 PM (later on weekends in summer). The last return ferry departs around 11:45 PM. After that, water taxis can be arranged but are expensive (€50+). There is one hostel on the island for overnight stays.

Luggage Tips

The ferry has open deck space for luggage, but Suomenlinna is best visited without heavy bags. The island has cobblestone paths, gravel trails, and stairs between fortress levels. Leave luggage at Helsinki Central Station lockers (€4-8) and visit Suomenlinna as a day trip.

Accessibility

The HSL ferry is wheelchair accessible with ramp boarding. The main path from the ferry terminal to the fortress is paved and relatively flat. However, many fortress areas involve stairs, uneven surfaces, and steep ramparts. A wheelchair-accessible route covers the main museum and visitor center area.