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

An ancient Egyptian temple in the middle of Madrid, Spain.

Avoid gangster interaction while window-shopping.

In the middle of downtown Brooklyn lies a 165 year old secret hidden right below the surface (closed to the public indefinitely).

Visit the monolithic tomb of America's most famous general.

This small section of the Sleepy Hollow Cemetery is rotten with famous authors' graves.

A faux European lane smack dab in downtown L.A.

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

Daily jousts and dancing barrel makers in Munich's mechanical clock.

The 340-year-old house that inspired the classic Nathaniel Hawthorne novel.

Pilgrimage site for star-crossed lovers.

The prototype for all Nazi concentration camps.

A tribute to Ponce de Leon's supposed quest for eternal youth.

Memorial of the Salem witchcraft hysteria in the town of Danvers, where it all began.

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

Macabre headstones carved with winged skulls, dancing skeletons, and pithy reminders of impending death.

The "Seinfeld" diner.

Lie in a hammock where George Washington stood.

Megachurch turned Catholic church comprised of 10,000 glass panes.

Frida Kahlo's childhood home, now a museum of her life and works.

A multi-storied adobe complex has been inhabited for more than a thousand years.

Ancient cliffs resembling a kilt on Scotland's second largest island emit an entrancing sound.

Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.

Blighted Irish field and the ruins of a 19th-century cottage on the edge of urban Manhattan.