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

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

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

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

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