The unique waterfall in Iceland's south features a backdrop of geometric black lava columns.

This natural rock formation features seemingly unnatural vertical ridges that have been blamed on elves.

The place where houses are born.

A futuristic temple of light uses prisms and rainbows to create an atmosphere of peace.

This castle was established by the 4th Duke of Montrose and is connected to the Buchanan Clan.

Each spring, a dreamlike carpet of bluebells overtakes the forest floor.

An artist's mausoleum with a haunting echo.

A series of modernist treehouse hotel rooms grace the outskirts of an Arctic forest.

Giant statue of a disembodied head.

Longest road tunnel in the world features an air treatment plant and the illusion of daylight.

A stunning silver lining to global warming's gloomy cloud.

Walk 2,300 feet above the ground on the "Troll's Tongue."

Board a mine car and descend the #190 slope 300 feet underground into the Clark Vein of coal.

The creek where a shark wreaked terror upon New Jersey, and served as the inspiration for "Jaws."

Eighteen mummies have stood guard behind the altar of this tiny church since 1833.

Relive a Polish uprising via an enormous, century-old cyclorama.

Most-visited and most-photographed slot canyon in the American Southwest.

Friction between grains of sand cause a curious "singing" sound.

A Belgian self-built tower inspired by the Bible and ancient civilizations.

A breathtaking canyon offers stunning views and frightful pathways through an ecological paradise.

Hellam Township is reputed to feature seven remote gates, which when passed through in the right order, open an entrance to hell.

Smallest house in Toronto sits on a lot meant to be just wide enough for cars to drive through.

Secret Swing.

This rare symbol of Eastern philosophy in the West has been created over years of painstaking construction by the local community.