We happened upon the ferry on a sunny morning and decided last minute to head over to the island. Great decision! Just a lovely and calm ride to the island on a comfortable ferry that runs about every 45 minutes ($8 round trip). Once on this historic site - consisting of four islands - you are free to wander through the fortresses, visit a military museum, and enjoy the spectacular views of Helsinki. Surprisingly, we ended up spending 5 hours wandering around before hopping on the ferry back. This is a great day trip, but pick a sunny day.

Visiting Suomenlinna Sea Fortress was a delightful experience. The historical charm of the fortress, set against the stunning backdrop of the Baltic Sea, created a picturesque setting. The well-preserved structures and informative exhibits offered insight into the area's maritime history. Exploring the labyrinth of tunnels and fortifications added a sense of adventure. The island's serene ambiance and scenic views make Suomenlinna a must-visit destination in Helsinki. A perfect blend of history and natural beauty, it's an ideal escape for both locals and tourists.

This looked like a very interesting fortress and island. Unfortunately, we were there during the coldest weather in several decades, so we didn't explore as much as we would have liked. Lot's of interesting history, museums and old structures. There are also several cafes and restaurants so you can plan on spending some time and having a place to eat.

Possibly not the best time of the year or day of the week (Sunday) to visit as it was mostly closed and bitterly cold but it was still class to see a world heritage site. It's one of the strangest places I've been with such a strange atmosphere. It kinda reminded me of a concentration camp or something. The military museum is well worth a visit as are the main fortress parts. We enjoyed the ferry trip over through the ice too!

Beautiful fortress. A short 10 min ferry ride to get to the island. We went through ice on the ferry which was different. Well worth the trip over. Takes about an hour to get there,visit, and get back. We enjoyed it.

We had time spare after the main attractions of the city so got the ferry over. It’s u clouded in your transport day ticket and only takes 10 mins. Nice to get another view of the city from the water. The island is nice to walk around, very quiet when we visited but some cafes and the visitor centre were open. Good place to spend an hour or maybe longer in the warmer months. K mart next to the ferry port there for snacks

Wow….. what a day out! This place was so much fun to walk around! Be sure to go off the blue line (major attractions) and explore further. We found so many tunnels that turned out to be an adventure. Very easy to get to with the ferry which is quick to get to the island (15 mins) and just explore for as long as you want. Take some snack with you as you could be there for a few hours.

The views out into the harbor and gulf from the ramparts are worth the walk. Most of the streets are granite cobblestones, which can be tough on the feet and ankles. You need at least two hours to take in just the basic sights. We had purchased an HSL multiple day transit pass (Areas ABC) which covers all modes of transportation including the ferry from Airport to Center City.

This mid 1700's Swedish built fortress is a highlight of any Helsinki visit. A ferry leaves from the city's harbour-front (even in snow/ice bound weather) with a ticket machine (no cash) and warm waiting room. Ferry takes around 15 minutes to traverse the harbour. Check the Museum once at the island, get a map and then (recommended) you follow the "Blue Line". If you do the full walk to the outer-side (King's Gate etc) it takes around 2 slow (ice n' gravel) hours for the return trip (with plenty of stops for photos). About 2/3rds along the walk, is a Museum and shop/restaurant. Try the local Finnish meat pie ?? and an excellent "flat white" coffee.

We bought a transport ticket (Zone AB will suffice), took the tram to the centre and jumped on the ferry (they go every 20 minutes) then went for a wander around this former naval fortress. It is a mere 1.5km walk to the furthest tip. There’s a church, museum, supermarket, homes and even a school (it’s inhabited). Plenty to explore for at least two hours (if not more).