St. Petersburg: Peter and Paul Fortress
Peter and Paul Fortress was originally designed to defend the city from naval attacks, but instead was long used as a political prison for dissidents of the tsarist regime and as a museum during the Soviet era. Nowadays, the fortress serves as a tomb for the Russian imperial family. The last resting place of every Russian ruler starting from Peter the Great to Alexander III is at the base of its elegant spire. In 1998 the remains of Nicholas II and his family were also moved there to join the remains of their royal ancestors.