3 Must-See Hop-off AttractionsTallinn is truly one of the gems of Northern Europe. If you have limited time to explore Tallinn on your trip then be sure to hop-off at these 3 top destinations. The first is, Russalka Monument, at Bus Stop 3 of the Red Line. This monument is a memorial to commemorate the Russian warship that sunk on its journey to Finland at the end of the 19th century. Further along the Red Line at Bus Stop 6, hop-off to experience the beauty of the Old Town. Nearby you'll find the Toompea Castle, which forms a central part of the Tallinn history and is now the home of the European Parliament of Estonia. On the Green Line, be sure to hop-off at Bus Stop 4 and visit the Maarjamäe Castle, one of the best tourist attractions in Tallinn.