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

A sacred site for Native Americans surveyed by George Washington and owned by both King George III and Thomas Jefferson.

A taxus-tree to which Julius Caesar reputedly tied his horse.

The Last Home of an Executed King.

The mummified right fist of a 1,000-year-old saint-king sits inside an ornate golden reliquary.

When the imprisoned pope's remains were finally returned to the Vatican, his heart stayed behind in France.

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

Dublin's "Dead Zoo" serves as a window to Victorian museum design.

The mummified heart of a saint lives on in this church—after a brief hiatus when it was stolen.

The Vermont grave of a 4,000-year-old mummy prince.

Constantly maintained, this organ is playing a six-century long composition by John Cage.

The site of Paul Revere's historic two lantern warning.

An Archaeological Wonder of Peru, and the largest stone ruin site in the New World.

Local legend has it that an old, decaying staircase outside this cemetery is haunted by dozens of ghosts.

Ancient paintings known as the "Sistine Chapel of Cave Art."

Temple complex that once housed the famous statue of Nike.

This ancient Greek place of assembly and marketplace is being revealed layer by layer below the modern Athens cityscape.

Mysterious lost empire of the Silk Road.

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

Three floors of musical instruments coming from all corners of the world and hundreds of years of musical history.

The Beaux-Arts aquarium boasts a vast collection of saltwater and freshwater fish on an island in the Detroit River.

Antiques shop filled with all manner of curious collectibles.

Amazing collection of folly buildings in Cobham, Surrey.

This Gothic Revival castle used as a shooting location for "The Secret Garden" and other films.