A Museum of Psychiatry in a still-operating mental institution.

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

Home to items never before seen by the public.

A 2,000-year-old computer demonstrates remarkable engineering and astronomical precision.

Hidden in a secluded Greek cove is a pristine beach marred only by the rusting smuggler's hulk stranded on its shores.

The hallucinogenic center of the ancient world.

Monasteries on rock pillars, once accessible only by frayed ropes.

The fishing boats that moor in this small lagoon enter and leave through a tunnel to the sea.

Overshadowed by other, more famous Maltese catacombs, this ancient burial chamber has one of the best examples of a ritual agape table.

These lesser-known Maltese catacombs date back over 1,700 years.

A hidden tunnel of bones in one of Malta's oldest churches.

This subterranean necropolis holds three floors of antler-dug grave caves.

The floor of this spectacular Baroque sanctuary is covered in memento mori.

Burial grounds for more than 1,000 bodies deep under the modern town of Rabat.

Stone Age solar temple is aligned with the sun on each equinox and solstice.

An abandoned set from the 1980 film "Popeye," claimed and repurposed as a theme park by creative locals.

This landmark church concealed a crypt packed with bones that was discovered thanks to the London Blitz.

This museum tucked below a charming cafe gives a brief snapshot of photographic history.

19th-century scientists would make the pilgrimage here to verify the precision of their measuring sticks.

A naturally mummified 2,000-year-old man.

This medieval sanctuary's tree-framed door looks like a portal to a mythical realm.

Created hundreds of years ago, the magical follies and landscapes at this park were almost lost to time before being restored.

Mysteriously stacked storefront paths give this medieval British town an iconic style like none other.

A historic London cemetery now serves as a nature park incorporating gravestones & memorial statues.