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

Resting in the middle of an Austrian river, this sci-fi "island" lets people cross in neon style.

Austria's ultra-modern art museum looks like Cthulhu's giant alien heart.

This building has survived for more than a century and remains virtually untouched.

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

A series of caves under Castle Hill that once held the prisoner Vlad Tepes, better known as Count Dracula.

This Budapest bar allows drinkers to leave their mark on the walls, floor, and even ceiling.

This French chateau is home to the world’s largest private collection of fighter jets.

Claude Monet immortalized this medieval bridge in two of his paintings.

This triumphal 16th-century arched gateway leads to the oldest street in Palermo.

Cave shrine on Monte Pellegrino.

A story of cutlasses carelessly carving a celibate centenarian's cemetery stone.

Geothermal waterfalls in Tuscany.

The only "Egyptian" pyramid in Europe and the legendary tomb of Remus.

Renaissance villa and gardens complete with a tormented colossus.

This community on a small Venetian island has taken to painting their houses in bright neon hues.

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.

Some believe that this ancient mural depicts technology far ahead of its time, but in reality it's nothing quite out of place.

This portrait of Philip V is always hung upside down, in a protest three centuries in the making.

Eat your Big Mac in a DC-3.

According to one legend, this bridge was crafted after monkeys formed a body-bridge across the gorge.

This 11th-century Greek monastery has renowned mosaics and relics of a brutal past.

Nibble as you learn about Slovenia's longstanding tradition of making beautiful honey cookies.