The origins of Tallinn date back to the 13th century, when a castle was built there by the crusading knights of the Teutonic Order. It developed as a major centre of the Hanseatic League, and its wealth is demonstrated by the opulence of the public buildings (the churches in particular) and the domestic architecture of the merchants' houses, which have survived to a remarkable degree despite the ravages of fire and war in the intervening centuries.
Tallinn è una città fantastica, assolutamente da visitare. La consiglio a tutti per un weekend. Ho trovato davvero utile questo link:
http://guide.eurbanlink.com/guida-turistica/iPad-guida-Tallinn/
Though Tallinn is a rather small but it has its unique vibe, especially during the summer when all the coffee shops and restaurants are open... street musicians add up to the atmosphere as well. You may want to check the posts about Tallinn on gEstonian guide http://www.way2estonia.com/ Pretty useful.