Peaceful gardens hide an underground torture museum.

This bridge was constructed from the rubble of the infamous Bastille.

Former hunting lodge of a duke who was an avid collector of impressionist works.

This life-size replica of the Statue of Liberty's flame is also a tribute to Princess Diana by default.

A little sculpture with a large wardrobe.

Cozy basement bar sports an inventory of over 2,000 beers.

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

A public urinal so pretty, it was declared a national monument.

The New York hotel where tragic visionary Nikola Tesla spent his final hours, destitute and alone but for the pigeons.

This mosaic dedicated to John Lennon was tended for years by a Beatles super-fan.

Wall Street has a new heroine, a bronze statue of a small but fierce girl.

This whimsical group of statues is a favorite of children who love to climb all over Lewis Carroll's beloved characters.

A pedestrian island in the middle of world-famous Times Square emits a strange (and purposeful) humming noise.

Whisper secrets in a busy station only to be heard on the other side of this acoustic arch.

Elevated freight railway turned wildly successful urban park.

This restored opera house is named after a soprano known for tragic romance, exile, and a truly uncomfortable wedding.

At least seven hues of blue and turquoise make this freshwater lagoon unique.

A 19th-century Baja cantina that many say is the birthplace of the margarita.

Gilded heaven for philatelists and architecture freaks, still in full working order despite sitting atop tremulous ground.

A graceful natural rock formation stands astride the point where the Gulf of California meets the Pacific Ocean.

A scientific repository of goiters, boils and other ailments throughout Mexican history.

An elaborate Mayan city shrouded in alien conspiracy revealed the tomb of Pacal the Great.

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

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