Go inside to really appreciate this 500-year-old technological masterpiece.

The once forbidden "secret cabinet" of erotic art from excavations of Pompeii and Herculaneum.

Five candy-colored villages on the Italian Riviera.

The last moments of the ill-fated Pompeiians, frozen forever in plaster.

Pompeii's less famous neighbor is still revealing her secrets.

A precariously balanced rock perches on the edge of a cliff created tens of thousands of years ago by glacial erosion.

The highest point in Maine is a grand gift to the state citizens that also happens to be one end of the Appalachian Trail.

These delicate buggers are some of the rarest fossils that have bubbled up from the Tar Pits.

This 1,300 year old monastery built atop a single rock was once only accessible depending on the whims of the tide.

This unreal Portuguese palace looks as though it's made from a pile of different castles.

This eccentrically decorated palace is replete with grottoes, fountains, tunnels, and caves.

An ornate century-old elevator still connects the two halves of Bad Schandau.

A whimsical bridge adorned with decorative dragons.

This one-time health resort was used by aristocrats around the world.

This massive subterranean fissure is known as the "underground Grand Canyon."

A little sculpture with a large wardrobe.

An underground city of salt.

Real bones which are said to have belonged to a Polish dragon.

St. Mary's features one of the most spectacularly decorated cathedral interiors in all of Europe.

This tribute to the 16th-century composer is now an unusual shrine to Michael Jackson.

These paved rills bring freshwater into Altstadt and could spell wedding bells for whoever stumbles into the waters.

The small alleys in Lübeck's Old Town are a result of medieval urban sprawl.

A monument to the three wars that led to German unification towers within a Berlin traffic circle.

A statue honors the local legend that the devil helped build St. Mary's church after being tricked into thinking it was going to be a wine bar.