This spring I was in Tallinn, and I heard about some caves under the Old City, as well as under all of Tallinn. Is it true or just rumors? If it is true, can anyone provide some info about them?
There are tunnels. While some are the casemates or part of the old fortress, many others have been found, dating back centuries.
has a good summary of what exists, what's theoretically accessible, and what's actually accessible to the public.
The exhibition of “Kiek in de Kök and Bastion Passages” reopened in March 2010 takes the visitor to a time journey that begins in 1219 and offers experience, information and entertainment.
With the help of innovative video- and sound-effects and means of multimedia the birth and evolution of Tallinn, the history of town fortifications and the most significant military events are introduced to the visitor.