The music is over at the Ballhaus Riviera Ballroom, but the ballroom remains in haunting disrepair.

A surreal museum of extraordinary industrial objects.

An "evil painter" included pointed symbols in this artwork to poke fun at members of the Danish Parliament.

This ordinary street was made infamous by a legendary visit from the devil.

Beneath Denmark's Højbro bridge, a bronze merman and his seven sons forever mourn for the mother and wife who left them for land.

Danish tourist destination well known for open stalls where vendors sell marijuana on the street.

This hidden collection of everyday objects illustrates life within communist Poland.

A hidden art gallery in an abandoned Warsaw fort.

A program of Communist glamour in post-Stalin Poland is preserved in this colorful museum.

After the famous composer died in Paris, his sister snuck his heart out of the country to honor his wish that it be buried in their native country.

A national collection of Communist-era musical posters.

Stay overnight in the world's most sleekly designed rabbit hole, free of charge.