This small town in the Netherlands has no roads but instead, miles of canals and over 100 bridges.

A floating cat sanctuary on an Amsterdam canal.

Cat art as far as the eye can see.

An Amsterdam street lined with antique shops each one dedicated to a different obscure collection.

This winding road through an Italian canyon may be the most scenic drive in the world.

This picturesque Umbrian city has a subterranean side that has long remained hidden.

This centuries-old Italian chapel hangs midway down a sheer cliffside.

This quaint Italian town keeps losing ground as the sides of its plateau slowly erode.

2300-year-old Roman road connecting the empire.

Stalactites and stalagmites in a beautifully lit cave.

This Venice bookstore has resigned itself to constant flooding by keeping its books in bathtubs and boats.

Hundreds of lucky felines haunt the ruins where Caesar was murdered.

An Italian crevasse filled with abandoned buildings gives visitors a look at the world without humans.

Hamburgers are intensely proud of their tunnel beneath the river.

A restaurant and observation deck built in a unique broadcasting antenna.

It's always summer at the beach inside this former airship hangar.

This "floating railway" is one of the world's oldest monorail systems.

"The most colorful grottoes of the world.

On the Spree bank, discover one of the last reminders of a symbolic wall that divided, and was torn down by the people.

This classic restaurant features a gorgeous mirror-clad room.

The largest free-standing aquarium in the world resides in a hotel lobby in Berlin.

A tour of underground Berlin takes you through WWII air raid shelters and tunnels used to smuggle people out of East Germany.

Ruins of a German Castle on top of a towering stone pillar.

This massive blockhead sculpture hides an entire library.