This narrow Ghent alleyway is an officially sanctioned street art tunnel.

You can spot this teeny tiny stained-glass window from the Bonifacius bridge.

The bronzed skull of a beheaded traitor was affixed to the city gate in the 17th century.

A piece of stonework relief commemorates the site where the Devil's rage, and odd apparel, destroyed a house.

The compass on its front was a handy tool for 17th-century merchants who needed to know the direction of the wind.

These giant yellow bowling pins seem to be defying gravity.

A UFO-shaped event building originally intended to be a science museum showcasing the future.

This historical Netherlands fortress still bears the marks of its single siege.

This centuries-old gothic monster has been converted into a sprawling, glossy bookstore.

In between two buildings in Ljubljana, medieval tunnel to nowhere.

A trough of 700 strange bronze faces runs through a narrow alley in Ljubljana's old town.

Martin Bricelj Baraga's monolithic sculpture measures the blueness of the sky, and changes color to match it.

Inspired by the Rialto Bridge in Venice, these three clustered bridges were just one part of a Slovenian architect’s grand vision.

When this monument to Slovenia's national poet was erected, it's said to have sparked the ire of nearby church authorities.

A public work of art that also provides some relief from the summer heat.

Buy raw milk from a 24/7 vending machine or pick up tomb candles at this local market.

A whimsical bridge adorned with decorative dragons.

This one-time health resort was used by aristocrats around the world.

Slovenia's first mosque is a striking mix of Islamic and modernist architecture.

Strange rumors surround the artist who created these solemn metal guard dogs.

Piran’s oldest square is laden with history and a beautiful 18th-century reservoir.

Brass cobblestones mark the places where individual Holocaust victims were taken from their homes.

A small cell adjacent to this church was once the bedroom for a renowned saint.

The crypts of Capuchin friars decorated with the bones of over 4,000 friars, including an entire "crypt of pelvises."