The Estonian Maritime Museum provides a detailed overview of nation's seafaring past. This museum in also located in city's Old Town, where it occupies one of Tallinn's former defensive structures – Fat Margaret's Tower. Another historical museum that can be found at city's Old Town, just behind the Town Hall, is Tallinn City Museum. It covers Tallinn's history from pre-history until 1991, when Estonia regained its independence. Tallinn City Museum owns nine more departments and museums around the city, one of which is Tallinn's Museum of Photography, also located just behind the Town Hall. It features permanent exhibition that covers 100 years of photography in Estonia.