The recovered bones of martyrs slaughtered during The Terror are on display in this church crypt.

A magical, macabre wax museum, beloved by locals, uses real artifacts to depict an assassination from the French Revolution.

The Sun King's military models, saved from the Louvre.

A museum dedicated to linguistics, from how babies learn to talk to endangered and extinct languages.

If you look closely at the oldest bridge in Paris, you might notice hundreds of ugly faces leering from its sides.

The history of radiation is on safe display at the foot of a radiation science laboratory.

The video game-themed street art first popped up in the French city.

The remaining relics of the patroness of Paris lie in a chapel under a striking double spiral staircase.

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

Bouncing, delightful, mechanical art at the MIT Museum.

The statue of John Harvard isn't actually John Harvard—or even, technically, the founder of the school.

This massive World War II calculator hearkens back to the days when "computer" was a job title.

Three prestigious academic collections come together to create a world-class natural history museum.

Impossibly life-like natural history models created out of glass by a father and son.

No telescopes, no power, no gift shop: The Observatory of Chichen Itza, one of the world's oldest observatories, takes astronomy back to basics.

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

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

This historic structure has been used as a mosque, a barracks, a prison, a school, and a bakery.

One of the greatest collections of coins in the world is housed in the former mansion of an archeological pioneer.

Where commuters walk through remnants of an ancient Greek necropolis.

A 2,000-year-old computer demonstrates remarkable engineering and astronomical precision.

The history of drinking is told through 1,800 cups, chalices, and glasses at this exhibit.

This giant sculpture made of trash is a critique of society's wastefulness.

Building owners can take out tiles for free at this repository for historic building materials.