Royals, rebels, and artists have all conversed at this grand 19th-century Viennese coffee house.

Beautiful Austrian natural history museum with carved ceilings and row after row of ancient taxidermy.

Soaring over 6,000 feet in the Bavarian Alps, this beer garden was once Hitler's 50th birthday present.

Dress up like a miner and take a slide into the disco-lit depths of this once foundational salt mine.

This Hungarian castle was built out of cardboard and wood until it proved so popular that it got upgraded to stone.

A fake Transylvanian castle houses a cathedral of antlers.

A trail of iron footwear stands as a monument to the thousands executed along this riverbank during WWII.

Built in 1870 at the bridge that connected Buda and Pest, this spectacular incline railway was almost lost forever during World War II.

The geographical center of Budapest is marked with a 10-foot-tall stylized zero.

For centuries, this large Roman villa remained hidden thanks to the eruption that buried nearby Pompeii and Herculaneum.

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

Before it was buried by volcanic ash, this fast-food restaurant fed the hungry hordes of ancient Rome.

The glowing blue Nymphaeum of Emperor Tiberius.

For over 300 years this little carving has been the city’s good luck charm.

Museum celebrating the ocean, with the largest wunderkammer dedicated to sea exploration.

This folk museum is devoted to small figurines of provincial village life.

This modern museum of Mediterranean culture is surrounded by a surreal concrete honeycomb.

Even France's favorite aquatic son Jacques Cousteau, couldn't get to the bottom of it.

Walk through living pictures and music in the Cathedral of Images.

The mental institution where Van Gogh created some of his most famous work now allows guests to walk in the artist's footsteps.

This ancient Roman bridge and aqueduct still stands as a wonder of classical construction.

The lost Latin words were reconstructed using the holes from the nails that once pinned them in place.

This ancient theater was once the home of fierce gladiatorial battles.

Fighting the British and making game shows for over 150 years.