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

Inside this former medieval prison is a collection of objects designed to inflict unbelievable pain and suffering on the human body and mind.

This bike path was sunk below water level for maximum wonder.

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

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

A collection of weird and wonderful art fills a former houseplant nursery.

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.

Artwork tucked within the trees greets visitors with surreal sonic experiences.

The "stairway to heaven" lookout tower was built to resist weather, arson, and the laws of physics.

What was once a bustling mining installation is now a bustling hub of contemporary art.

Part modern art project, part traditional chapel, this see-through church is only substantial from the right angle.

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

Each spring, a dreamlike carpet of bluebells overtakes the forest floor.

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

A 14th-century fortified keep showcases the masterpieces of an ingenious 20th-century clockmaker.

Most prolific publishing house in the 1600s open to the public.

Christ's blood preserved in a Belgian town.

This ghost town in Belgium will lose its street art when it ceases to exist.

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