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

This giant urban staircase was built to keep the city's brave fighting men from getting waylaid in the red light district.

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

A moving memorial to the fallen and missing from WWI trenches.

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

When you're a great Russian Tsar, even your vomit gets a statue.

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

Brussels' favorite peeing boy has a sister.

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

A little sculpture with a large wardrobe.

Hiding the longest subterranean river known in the world.

From Tintin to the Smurfs, Europe's greatest graphic icons are celebrated in a grand Art Noveau gallery.

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

Cozy basement bar sports an inventory of over 2,000 beers.

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

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