Northern Ireland's Brobdingnagian stepping stones.

Ireland's most remarkable collection of these curious cone-shaped houses is worth the buzz.

This single room has survived the centuries with almost no deterioration.

Perfectly preserved ancient monastery in an impossibly dramatic location on a rocky island in the Atlantic.

This floating garden in the sky is straight out of a fairy tale, but the real thing is nothing short of magical.

A strange egg in a mucky bog of western Ireland marks the spot of an aviation milestone.

A moody and picturesque riverside ruin overgrown with vegetation.

An Iron Age fort on the edge of a seaside cliff offers a glimpse into an ancient, mystical world.

The world of the ancient Celtic civilization explained through a bewitching 11 acre garden.

A steam trawler with a whiskey-soaked history driven ashore in 1960 resides rusty but still standing on the shoreline.

An eccentric garden of sculptures crafted in India decorate an Irish green space dedicated to Alan Turing.

An avant-garde artist is survived by his seaside garden.

Huge concrete structures designed as an early warning system for Britain to detect enemy aircraft.

A million and a half tons of earth were used to create one of the world's largest land sculptures.

Rare collection of medieval books under lock and key.

The deepest lake in the United States, and once the site of epic destruction that lives on in legends.

This Oregon farm is dedicated to teaching people the professional art of tree climbing.

A deserted hodgepodge of experimental structures designed by nearby university students.

Plenty of old carney magic still haunts this photogenic amusement park.

A desert settlement founded and later abandoned by Hawaiian members of the Church of Jesus Christ of Latter-day Saints in Utah's Skull Valley.

Nine of the very few concrete ships ever made in the U.S. are beautifully decaying off a Virginia pier.

An Italian hillside ghost town.

A creepy, deserted mock Arabian village can be found in the middle of the Qatari desert.

A haunting theme park is slowly being swallowed by the jungle.