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

The site of one of the strangest disasters in history—a wave of deadly molasses traveling at 35 mph.

A historic bridge with a lovely acoustic anomaly.

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

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

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

How did a French journalist’s grave become the sexiest statue in the cemetery?

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

The headless bodies of more than 1,300 guillotined victims of the Reign of Terror are buried here in mass graves.

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

Noirish green neon marks the location of one of the oldest private detective agencies in France.

This small-town Connecticut restaurant gives each diner a free book from its vast library.

An old trolley bridge was converted into a breathtaking garden bursting with colorful flowers.

This anonymous businessman sculpted in bronze became an enduring memorial after 9/11, and had been mistaken by rescue workers for a survivor in the rubble.

The most confusing clock in New York.

Lady Liberty's first beacon of enlightenment is now displayed in a museum near the statue.

An artist's cute bronze subway sculptures belie his violent artistic past.

This kitschy tavern is also home to rare early editions of "Treasure Island."

The only rotating bar in New Orleans has been slowly spinning since 1949.

The two writers famously didn't come to blows over the Oxford comma.

This headstone marks the grave of an 11-year-old boy killed during clashes in the streets over the boycotting of British goods.

One of the oldest used bookstores in the U.S. has been selling antiquarian treasures since 1825.

This upscale streetwear store is hidden behind a fake Snapple machine in the back of a deli.

A Harvard-area eatery preserves the uncovered tiles of its century-old predecessor.