A massive, gleaming sea turtle with a rider atop its shell looks out over the horizon.

This memorial museum chronicles the apocalyptic destruction of the First World War.

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.

Somewhere there is a giant who can no longer poop, but now travelers can stay inside his anus.

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

Christ's blood preserved in a Belgian town.

A little sculpture with a large wardrobe.

This recently restored crypt was once plagued by liquefying coffins and exploding caskets.

This charming, hidden guild museum holds some 700 years of crossbow history.

Europe's official "zero-level," the equator of elevation.

A public urinal so pretty, it was declared a national monument.

One of Amsterdam's narrowest houses is located right across the canal from its widest.

Colorful and chaotic stacked hotel in North Holland.

Three connected pink triangles memorialize persecuted gays and lesbians throughout history.

This unattributed sculpture in Amsterdam is hiding in plain sight.

The attic of a four-century-old canal house hides a clandestine church.

Famed for its pie, this eatery has a hidden tunnel that allowed Catholics to secretly walk to church during the Reformation.

Established in 1638 to battle the Black Death, Hortus Botanicus Amsterdam is a treasure trove of rare flora.