The final resting place of many of Germany's most famous communists.

A monument to the "father of modern warfare" Gustav II Adolf.

This cafe offers a curated collection of treats and tipples made by monks and nuns.

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

An underground city of salt.

Metro station with a claim to rock n' roll fame.

An abandoned NSA listening post on Berlin's "Devil's Mountain."