Hidden within a Netherlands crater is a stone bed that lets those who lie in it see the sky as a curved surface.

This demon atop the Notre-Dame de Paris looks utterly bored.

The approximate spot where the last Grand Master of the Knights Templar was put to death.

Remains of Roman amphitheater hidden in a sleepy quarter of Paris.

The celebrated eyesore created by starry-eyed sweethearts.

A Parisian exterminator's shop whose storefront displays stuffed rats hanging from traps.

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

The tallest church in Mechelen might have been the tallest in the world if not for a lack of funds.

This interactive sculpture allows visitors to leave a message in case a friend passes by.

This legendary giant, born from vegetables, terrorized townspeople and cheated local children in games.

The legendary giant's severed hand sits on Antwerp's popular shopping street.

This statue dedicated to the story of a Flemish boy and his dog was relatively obscure in Belgium, but a cult sensation in Japan.

A man throwing a giant severed hand towers over Antwerp’s main square.

This 47-story "M" needed 20 years to be completed

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

Nicolas Schöffer's massive interactive sculpture was assembled in 1961 and brought back online in 2016.

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

Four giant movable street lights decorate this modern Rotterdam square.

The struggle of a small Dutch island against the sea.

This small town in the Netherlands has no roads but instead, miles of canals and over 100 bridges.

An early 20th-century bullring converted into a modern shopping center.

A vista of the city and sea from atop the little-known viewing deck on an unassuming Columbus statue.

The 2,000-year-old Roman columns are hidden within Barcelona's Gothic Quarter.

This mountaintop observatory is home to one of the world's largest reflective telescopes.