World's largest bell sits on the grounds of the Kremlin in Moscow.

This building holds the embalmed remains of the leader of the Bolshevik Revolution.

Former headquarters of the KGB.

Replica of mosque destroyed by Russia in the 16th century.

Abandoned limestone cave was once a sacred place of worship.

Sparkling, calcite-covered skeletons of children who may have been sacrificed to appease an angry god.

Despite attempts by local police to discourage it, Beatles-inspired graffiti has been a means for artists to air grievances for decades.

Macabre astrological automaton clock dating to the late 1400s.

A church of bones, decorated with 40,000 human skeletons.