Largest illuminated advertisement sign in the world.

A magical and peaceful ruined Cistercian abbey in what is now southern Belgium.

A once-magnificent collegiate church is falling into ruin.

This abandoned Belgian fortress is purposefully being left to nature.

A marble Lucifer hides behind the pulpit of this Gothic cathedral.

Each time a baby is born in Ghent, these streetlights flash in silent celebration.

This fairytale castle was built as a show of power but was nearly torn down thanks to its history of torture.

A Museum of Psychiatry in a still-operating mental institution.

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

A true Valhalla for cactus and succulent lovers.

A statue of the second-tallest Dutchman in history.

Elegant marble and old vaults fill this historic Dutch bank turned office space.

A dramatic art installation features a BMW flying out of a building in Rotterdam.

The Netherlands' first car tunnel has an unusually rectangular shape.

A strangely curved lamppost stands tall over this avenue in Rotterdam.

This charming pup is meant to celebrate the youth and stubbornness of the city's students.

An early 19th-century English style garden hidden in the Rotterdam cityscape.

A nearly 25-foot concrete sculpture of Sylvette, Picasso's muse.

A huge teapot illuminates a home for the elderly.

Rotterdammers' dirty minds gave this santa a dirty nickname and cursed it to a life of wandering.

The patron of this extravagant Art Nouveau confection insisted that nothing less than a boat should project from its facade.

An open-air sewer system that was covered piece-by-piece over 300 years.

A tiny island is connected to the mainland by a private railway that residents travel in their own personal wagons.

Rows of multicolored bathing huts paint the sand dunes with pops of color.