No shoes allowed on this trail, which is designed to be experienced barefoot.

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

Banished from town, this local jester concocted a clever return.

Tintin's creator is celebrated in an immersive museum that's an astounding work of modern art.

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

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

A giant bug impaled on a 75-foot-tall needle.

This whimsical statue dumps water on its head to symbolize knowledge flowing into his brain. Or maybe booze.

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

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

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

A rare example of World War I trenches from the British front.

A little sculpture with a large wardrobe.

Hiding the longest subterranean river known in the world.

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

This collection of over 50 murals celebrates Brussels' rich history as the self-proclaimed home of the "comic strip."

Climb inside an iron crystal magnified 165 billion times its normal size.

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

The ruins of the largest gladiatorial school in Rome are largely hidden under modern streets.

The last bastion of Roman presence north of the Alps looms over a German town.

Hamburgers are intensely proud of their tunnel beneath the river.

Once the tallest building in the world, this abandoned church is now a monument to the destruction of WWII.

This bewitching Babylonian goddess haunts a hallway of the British Museum.

Berlin's old airport.