One of the most mystical places in Tallinn's Old Town is located in the basement of the former Dominican monastery. The monastery was established in 1246 and is one of oldest well-preserved buildings in Estonia. An art gallery is now housed inside the monastery. It is located near the Viru Gate at 33 Müürivahe Street. Exhibitions change regularly.
One of the first libraries in Tallinn was located inside the Dominican monastery. In addition to viewing the old library, visitors can also see the old sacristy, vestry, and dormitories used by the monks and leaders of the city.
There were originally three inner chambers inside the monastery but only the eastern chamber has been preserved. The dormitory, library, dining room and other rooms provide a fascinating opportunity to take a peek into the life of medieval monks. A mysterious "energy column" is located in the basement. According the legend it can be a source of physical and mental well-being.
More information can be found here.