The Dominican monastery was founded in 1246 and it is the oldest one in the medieval old town. The center of monastery was St. Catherine's Church, which was completed in the late 1300s and was the largest church building in the lower town. The Monastery was expanded several times, most recently in the 16th century.
St. Catherine's convent closed down in 1525, when the monks were expelled from Tallinn during the Reformation. The looted and empty monastery church was destroyed by fire in 1531 - only ruins were left.
There were originally three inner chambers (together so-called claustrum) in the monastery allowed only for residents. The claustrum housed the most important rooms in the monastery: the prior’s room, the old library, the chapter hall, the dormitory, the sacristy, the cloister and the vestry. In the 14th and 15th centuries the leaders of the knight guilds of Harju and Virumaa often used the claustrum as their meeting and gathering place.
Only the eastern chamber has been preserved to our days. 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.
References: VisitEstonia, ABC Matkatoimisto
Ehrenbreitstein Fortress was built as the backbone of the regional fortification system, Festung Koblenz, by Prussia between 1817 and 1832 and guarded the middle Rhine region, an area that had been invaded by French troops repeatedly before. The fortress was never attacked.
Early fortifications at the site can be dated back to about 1000 BC. At about AD 1000 Ehrenbert erected a castle. The Archbishops of Trier expanded it with a supporting castle Burg Helferstein and guarded the Holy Tunic in it from 1657 to 1794. Successive Archbishops used the castle's strategic importance to barter between contending powers; thus in 1672 at the outset of war between France and Germany the Archbishop refused requests both from the envoys of Louis XIV and from Brandenburg's Ambassador, Christoph Caspar von Blumenthal, to permit the passage of troops across the Rhine.