The crumbling ruins of an abandoned 12th-century monastery.

This enigmatic Roman tower lurks just outside Belmonte.

A 19th-century mansion houses the largest collection of gin in the European Union.

Rainwater transformed this old quarry into a peaceful pond you won't find in most tourist books.

Depending on the region's rainfall, this church may be partially submerged.

It's unclear what caused the fire that led to this opulent hotel's demise.

At the very tippity-top of Europe is a cliff from which you can view the midnight sun.

The world's largest underwater restaurant is submerged off the southern tip of Norway.

A haunting deserted hotel is a favorite with artists and photographers.

Museum dedicated to "the man who moved the Earth."

These massive moving sand dunes have swallowed an entire village and are still on the run.

A program of Communist glamour in post-Stalin Poland is preserved in this colorful museum.

The walls and ceiling of this Polish church are decorated with thousands of skulls, with another 21,000 skeletons just below.

An icon of International Style architecture on the outskirts of Rotterdam.

Building Men of War and Indiamen from Holland's Golden Age.

The 20-mile causeway that separates the Netherlands from the sea.

Where royalty waits in the height of luxury.

A 1:20 scale piece of the Netherlands commissioned by a queen lets visitors take a stroll as giants.

Rumored to have been frequented by Vincent van Gogh, it's the only remaining genever producer in the Hague.

The former headquarters of history's oldest megacorporation.

Two gravestones clasp hands over the religious divide.

This 1920s Amsterdam neighborhood was built as a giant experiment in concrete construction.

Incredible labyrinth of man made caves.

This miniature take on the Kremlin is one Dutch man's retirement project.