One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

Bordered by forest on three sides and the ocean on the other, the Great Dune of Pilat is the highest sand dune in Europe.

The encased skull that is widely believed to belong to St. John the Baptist.

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

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

Three floors of musical instruments coming from all corners of the world and hundreds of years of musical history.

A little sculpture with a large wardrobe.

Brussels' favorite peeing boy has a sister.

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

Lavish royal estate punctuated with heated greenhouses.

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

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

Theme park featuring miniature replicas of European monuments.

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

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

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

Housing the groundbreaking maps and globes of Gerard Mercator.

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

This French ghost town from World War II has been left as a memorial to German atrocities during World War II.