A collection of art from Bulgaria's time as a communist state.

Head underground and take a tour of the city's working sewer system, and see the underground river Senne, which defined Brussels for centuries before being covered in the 19th century.

This gruesome biblical parade celebrates the one day a year that a bit of Jesus' blood turns to liquid.

A beer pipeline runs beneath Bruges.

The Belgian royal family's private depot now stands abandoned and forgotten alongside the tracks.

Potato-peeling mannequins, Inca art, and a dangling tuber mobile help trace the history of fries at this Belgian museum.

Rare wooden escalators lead deep down into an otherwise staggeringly monotonous tiled tunnel.

A fantastical 13th-century fortification sandwiched by a modern hotel in central Brussels.

When you're a great Russian Tsar, even your vomit gets a statue.

Brussels' favorite peeing boy has a sister.

Christ's blood preserved in a Belgian town.

Meet the bronze beloved pet to a family of famous peeing statues.

This once-derelict building is now one of the most beautiful bookstores in the world.

This charming cobbled backstreet is the most Instagramable street in Paris, much to the residents' annoyance.

From overly ambitious (and eventually abandoned) atomic dream to bustling office park.

One of only three fountains created by the iconic architect Friedensreich Hundertwasser.