This charming colonial alleyway is one of the oldest continuously used residential streets in the U.S.

A layered tribute to the work of mosaicist Isaiah Zagar.

America's most famous museum of medical oddities is home to the remains of Albert Einstein's brain.

World's first "penitentiary," meant to be humane, drove men insane.

Richard III supposedly disposed of his nephews' bodies here in an effort to seal his claim to the throne.

Eighty million natural history specimens call this gargantuan museum home.

One part local history, 99 parts gruesome haunted house.

This ornate Victorian marketplace was the setting for Diagon Alley and the Leaky Cauldron in the Harry Potter films.

This historic covered bridge contains a series of macabre paintings that communicate one thing: everyone dies.

This memorial commemorating fallen Swiss Guards of the French Revolution has been called the saddest stone in the world.

Jail from the 19th century that was built by inmates.

The rotting skeleton of a shoreside fun fair that was destroyed by fire and storms still haunts the Brighton ocean view.

A grand Gothic Revival basilica with stained glass depictions of Montreal's religious history has only one soul resting in its crypt.

This distinctive Crescent City tradition dates back to the days of horse-drawn carriages.

In the middle of one of South America's most historic walled cities lies a bar with an enormous collection of Soviet memorabilia.

The colonial city's social history is reflected in its fanciful door knockers.

In Coyoacán, a pair of coyotes crown a public fountain in reference to the ancient Aztec name of the borough.

The turquoise-studded skull of a long-dead Aztec man sits within Mexico City’s Museum of Anthropology.

Once home to an aristocratic family and a workers' organization, this intricately tiled building now houses a chain restaurant.

These spectacular, symbolic serpents lie within the shadow of the Great Temple.

A barbarous band of serpents guard the bases of these Aztec temples.

This incredible college library is a visual masterpiece of mosaic art. It also looks kind of like a giant boombox.

The ruins of an ancient temple to the Aztec wind god discovered in the middle of a metro station.

A disquieting Aztec sculpture displays hundreds of stone skulls representing the victims of human sacrifice.