A cablecar-station-turned-revolving restaurant with 360-degree views of the Swiss skyline.

Clap your hands at the base of the pyramid, and the song of a sacred Mayan bird will echo through the air.

A magical sinkhole on the Yucatán Peninsula is adorned with mini waterfalls and hanging vines.

Every equinox this Maya pyramid puts on a spooky ancient light show.

The rocky remains of an ancient Greek forest.

Where commuters walk through remnants of an ancient Greek necropolis.

The ruins of an abandoned medieval city where the last Byzantine emperor was crowned.

This legendary city has been a tourist attraction for centuries.

The hallucinogenic center of the ancient world.

Ancient Egyptian relief, claimed to depict an electrical light.

One of the most well-preserved temples of ancient Egypt.

An "inside out" building in the historical center of Paris, featuring Europe’s largest modern art museum.

Site of a classic 19th-century physics experiment to prove the earth is rotating.

An unusual round church in London with a Templar past.

This demon atop the Notre-Dame de Paris looks utterly bored.

This facility has manufactured stunning tapestries for France's royalty ever since the 17th century.

Remains of Roman amphitheater hidden in a sleepy quarter of Paris.

A series of abstract, silly sculptures represent the works of a great modern classical composer.

A museum on the history of Paris, including a set of Napoleon's toiletries, Proust's room, and relics of the Revolution.

Medieval museum built over Roman baths that features famous tapestries of a lady and a unicorn.

France's most famous cemetery, with some of its most curious tombs.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

Two stone columns flank the grand Venice square, but there were supposed to be three.

One of the world's oldest working clocks is curiously missing the Zodiac sign of Libra.