A science teacher's dream.

Hear the quietest sound from across the dome.

Disney World's very first waterpark is now an abandoned ruin being reclaimed by the swamp.

A Lovecraftian altar of nightmarish bronze chairs sits ominously on a boardwalk in Puerto Vallarta.

High atop the Eiffel Tower is a small apartment built exclusively to entertain the science elite and make the rest of Paris jealous.

A horde of stray cats rule in this secluded Parisian cemetery under a bridge.

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

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

A Parisian cemetery where the elite and artistic are interred beneath an eccentric collection of tombs.

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

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

This iconic Parisian bookstore doubles as the "Tumbleweed Hotel" for traveling writers.

This modest marker near Notre Dame identifies the very center of Paris.

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

A large circus museum with summer performances.

A bizarre house filled with an astounding array of collections.

This monolithic statue was erected in honor of Chief Black Hawk (even if it wasn't made to look like him).

The palatial McDonald's that inspired Wesley Willis.

What's left of the ruins of the 1893 Columbian Exhibition, or World's Fair, also known as the White City.

These pretty kitties killed and ate as many as 135 railway workers.

This botanical garden outside Chicago boasts an array of more than 300 varieties of lilacs.

Arguably the best example of an authentic Dutch windmill in the United States, rivaling its counterparts in the Netherlands.

World's second largest particle accelerator, where nature reveals its secrets.