This triumphal arch celebrating the Sun King's conquest of Lille is a masterpiece of military architecture.

Tables of secondhand books fill the inner courtyard of this 17th-century stock exchange.

Lavish royal estate punctuated with heated greenhouses.

This collection of solar timekeepers includes the world's first digital sundial.

An expansive complex of subterranean tunnels is all that remains of one of Europe's most formidable medieval fortresses.

Rare wooden escalators lead deep down into an otherwise staggeringly monotonous tiled tunnel.

Brussels' favorite peeing boy has a sister.

Drink among marionettes at this pub inside a historic puppet theater.

A little sculpture with a large wardrobe.

This breathtaking monastery was established by Saint Benedict himself 1,500 years ago.

This serene, turquoise lake in an extraordinary nature reserve showcases a rare natural phenomenon.

Petting this mysterious iron monkey supposedly brings good luck.

A 141-foot wave of crashing lumber guards the entrance to the Grand Place in Mons.

A musical instrument played by the sea.