The numerous and mysterious passages inside the bastions were constructed simultaneously with the building of bastions in the 17th and 18th centuries. The earliest passages were constructed in the 1630s. The purpose of the bastions was to enable firing upon the attacking enemy on both flanks. The guns were lined up on top of the bastion. The hidden passages were constructed inside the bastions in order to shelter the men, ammunition and supplies but especially to hide their relocation from the enemy. The passages also served as observation posts to spy the enemy's activities in mining explosives.

During one hour bus tour the guide introduces the centre of Tallinn city and gives a brief overview of Estonian history. The tour continues at Bastion Passages where the group will have a guided tour for approximately one hour.

On Mondays the passages are closed.

Booking ahead is necessary.

Total duration of the tour is approximately 2 hours

Group size: 10-20 pax