The Secret of the Hidden Chamber - Adventure Tour

According to legend, Viaporg's founder Augustin Ehrensvärd left behind a secret: a chamber where the fortress's treasure is hidden. King Gustav III has arrived in Viaporg to search for this mysterious chamber - and now invites helpers to join him.

The Secret of the Hidden Chamber is an adventure tour based on historical background information, aimed at children aged 6-13 but also suitable for adults. The route passes through tunnels, bastions and the landscapes of the 18th-century fortress town of Viaporg.

Starting point: Artillery Bay, Suomenlinna

In Finnish:
9.6.-27.6.2026: Tue, Wed, Thu & Sat at 12.00 (not 18.-20.6.)
30.6.-8.8.2026: Tue, Wed, Thu & Sat at 12.00 & 15.00
Also 15.8. & 22.8. at 12.00

In Swedish (Dolda kammarens hemlighet): 6.6. / 13.6. / 27.6. / 3.7. / 10.7. / 17.7. / 24.7. / 31.7.

Price 16 €/person, age recommendation 6+, duration 1.5 hours. Suomenlinna is accessible by water bus or HSL ferry from Market Square (ferry fare not included in ticket price).

Note! Children must be accompanied by an adult and bring their own torch, weather-appropriate clothing and sturdy shoes. The tour route is not suitable for pushchairs and is not accessible.