Originally, Suomenlinna was equipped with several gunpowder magazines for protecting the gunpowder from moisture and enemy fire. One of the two remaining magazines has been transformed into a banquet facility for maximum 60 people.

• Facilities: banquet hall, kitchen for heating food

• Equipment: screen, data projector, internet connection (WLAN), mixer-amplifier, CD player, microphone, flipchart

The Gunpowder Magazine has no windows and is the perfect place to enjoy parties and meetings without the constant ringing of cell phones, as they do not work in the facility due to the thick earth roof. The entrance to the hall is through an old, narrow defence passage. The other defence passage hosts a small kitchen. The hall itself is a tall, brick-built barrel vault.