The Secret of the Hidden Chamber, Adventure Tour in Swedish

Arrive in Suomenlinna and come solve the mystery of the hidden chamber! Please note: the tour is in Swedish.

📅 Sat 6 June 2026, 15:00–16:30

📍 Suomenlinna Museum, Suomenlinna C 74, Helsinki

🎫 €16

Rumour has it that Augustin Ehrensvärd, the builder of Viapori, left behind a secret: a chamber hiding the fortress’s secret treasure. King Gustav III himself has arrived in Viapori to search for the mysterious chamber.

Finding the treasure may, however, require both cleverness and courage. That is why Gustav III is now calling on trusted helpers to join an exciting adventure that leads into dim tunnels, the shadows of bastions, green gardens and the life of the fortress town.

Come to Suomenlinna and set off on a journey back to the 18th century to solve the secret hidden within the fortress. The adventure can begin!

The Secret of the Hidden Chamber is an adventure tour for children aged 6–13, based on historical background information and also suitable for adults. The tour takes participants on a fun journey back in time to 18th-century Viapori. Along the way, adventurers follow clues and solve hints. They will encounter exciting situations and unusual events from times gone by.

The tour introduces Suomenlinna and the 18th century in a fun and memorable way.

The tour is in Swedish.

During the Maritime Helsinki weekend
Sat 6 June 2026, 15:00–16:30

Starting point: Suomenlinna Artillery Bay
Tickets: €16
Children must be accompanied by an adult.
The tour route is not accessible.
Bring a flashlight, weather-appropriate clothing and good footwear.

Buy your ticket