An unrealized dream to wirelessly electrify the entire Earth.

A master of trompe-l'oeil creates a stunning, tourist-fooling dome out of a flat ceiling.

Venice's island of the dead.

Go inside to really appreciate this 500-year-old technological masterpiece.

Once the home of a hermetic monk, this cave now houses a small church.

Budapest's Communist-era statues, banished to the suburbs.

The final resting place of the great navigator, or maybe his brother.

Geological storytelling.

Cliffside houses provide a spectacular view from their perch above the valley.

Remnants of the most densely packed city in world history, that thrived on anarchy for 30 years.

Blighted Irish field and the ruins of a 19th-century cottage on the edge of urban Manhattan.

The key to turning shifting dunes into the green oasis of Golden Gate Park.

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

Not merely a museum – but a whirring powerhouse that offers a subterranean peek into the heart and soul of cable car operations.

A perfect turquoise lake colored with glacier dust.

This strange geological landscape erupts with sudden bursts of water.

Tubing through a cave lit with glowworms is a magical underground experience.

Walk in the footsteps of the gods and straddle two tectonic plates.

Iceland's largest lagoon is home to stunning multi-colored icebergs.

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

The original home of the Lego has a huge amusement park dedicated to the iconic plastic toy.

This "preacher's pulpit" once used for pagan ritual, is home to a new, and dangerous ritual.

Norway's national monument to fallen seamen.

Housing the famous Norwegian ice-defying 19th century polar exploration ship.