This 30-foot pile of rocks may be the grave of a mythological Irish queen.

This World War II relic let Allied pilots know they were entering neutral airspace.

A tiny microvalley etched into the side of Knocknarea Mountain hides another world.

A small world of mechanical magic and metal merry-go-rounds in a Outsider art Museum.

A mosaic-tiled house built by graveyard sweeper Raymond Isidore.

The famous winding walk at Chartres is surrounded in mystery and myth.

Paris' linguistic guide to the international language of, yes, love.

An abandoned beach resort in Normandy reclaimed by artists.

A 18th century graveyard and its astonishing cortege of macabre iconography.

Ruined 11th century abbey built by King David I in Edinburgh, Scotland.

The fountain marks the area where hundreds of accused witches were burned at the stake.

A colorful piece of contemporary art cheerfully clashes with Lyon's historical architecture.

A neighborhood church's unusual abstract stained glass was the final project of avant-garde artist Jean Cocteau.

If they push on just the right spot, even the weakest person can move this titanic boulder.

This shop and gallery is a modern-day cabinet of curiosities, unassumingly positioned along an urban thoroughfare.

This South London cemetery holds the remains of more than 15,000 people.

This churchyard arbor is surrounded by hundreds of gravestones placed there by author Thomas Hardy.

A Victorian natural history and ethnographic museum with wonderful turn-of-the-century, science-book-esque evolution displays.

A historic arboretum and non-conformist, non-denominational park cemetery.

The sixth of London's "Magnificent Seven" cemeteries, and a source of unlikely inspiration to Beatrix Potter.

The monster at the center of the Darwin Center Spirit Collection.

A makeshift shrine to the late rock star is still kept up on the nondescript façade outside 1 Logan Place.

A hands-off space for graffiti artists to hone and display their skills.

A 1,215-foot tunnel transports pedestrians beneath the River Thames.