"In the Dark" Restaurant in Paris offers dinner in complete darkness.

A surrealist timepiece by the artist of melting clocks.

A mechanized clock where a man fights off a dragon, crab, and rooster.

This whimsical castle of grottoes was the labor of love of a French postman, and one of the greatest achievements of outsider architecture.

A museum of carnival attractions where you are invited to ride the rides.

In Coyoacán, a pair of coyotes crown a public fountain in reference to the ancient Aztec name of the borough.

You can see three Irish counties from this Neolithic hillside fort, once the seat of the Kingdom of Ailech.

The remains of the wrecked steam trawler can be found on the beach at low tide.

This controversial Irish show cave is home to a massive formation known as the Great Stalactite.

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

Modern sundial uses ancient methods to tell time and date perfectly.

A subterranean playground in an abandoned slate mine.

A miniature Italianate fantasy village on the coast of Wales and the set of ITC classic "The Prisoner."

The remains of this deep, dark mine have left behind a haunting rocky warren of tunnels.

A moody and picturesque riverside ruin overgrown with vegetation.

Once the longest bridge in Ireland, this rusting span sits abandoned and overrun by nature.

This ancient Irish religious site is covered in ancient carvings, many of which have barely aged.

Local legend says the remains of Father Christmas lie within the medieval grounds.

A mysterious Neolithic tomb is perched along the edge of a modern golf course.

This burial pyramid in central Ireland is thousands of miles and thousands of years away from its Egyptian inspiration.

This Irish show cave is said to have been the site of a Viking massacre that claimed 1,000 lives.

Wallabies live naturally on this Irish island.