Two very green residential towers cleaning the air in one of Europe's most polluted cities.

An Ethiopian "Jerusalem" featuring a church hewn out of a single rock.

Ethiopia's "smoking mountain" is in one of the hottest regions on the planet and is home to two lava lakes.

An elaborate Mayan city shrouded in alien conspiracy revealed the tomb of Pacal the Great.

Lost subway station nestled beneath Toronto's busy commuter line.

A collection of more than 12,000 shoes, displayed in a building shaped like a shoebox.

These strikingly barren, rolling red hills were caused by bad farming practices.

These mysterious ancient stone spheres were created by a civilization lost to time and are now mostly lawn ornaments.

An ocean in the making, in the Ethiopian desert.

The hottest place on the planet.

Once close to extinction, there is no shortage of elephant seals on the beaches of Año Nuevo State Park.

This small group of sand dunes manages to pack in a strange rainbow of colors.

A submerged archeological park still holds the wonders of a Roman Sodom.

A sulfuric hellscape in southern Italy.

These concrete domes were installed on an Icelandic bluff to honor a very specific musical tradion.

This modern monument to pagan belief looks like it was transported straight from ancient times.

Three million year old fossils are exposed for all to see on this Icelandic shore.

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

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

This mountain fissure hides a secret path to a secluded mossy grotto within the rock itself.

A sulfuric martian landscape that looks far better than it smells.

Medicinal spa created with the discharge from a geothermal energy plant.

This scenic Icelandic lava flow is named for a pair of Berserkers who were murdered, according to a famous Saga.

Largest private bird collection in Iceland, formed from a tragic accident.