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

At the center of an island in the middle of the Indian Ocean is a deep chasm ringed by tall waterfalls.

On one of the world's most active volcanoes, a pebble-filled crater changes color with the wind.

This stunning limestone waterfall is the highest in Estonia.

Every half hour, the flow of this unusual spring cycles between a rush of water and barely a trickle.

This industrial area was the dumping ground for massive amounts of trash, some of which washes up as tiny bits of sea glass.

A prehistoric landscape hidden in the cliffs of Maha'ulepu.

It might not be the prettiest pyramid in Egypt, but it may be the muddiest.

This ancient burial site is believed to be one of the first earthquake-protected structures in the world.

The palace of the King of Kings, burned by Alexander the Great.

The ancient necropolis houses the immense rock-cut tombs of four Persian kings.

The largest-known fragment of an asteroid that exploded over the southern Ural region in 2013.

A glimpse of a waterfall is reached by a steel catwalk along a slot canyon located in an Ouray city park.

An enormous Soviet aircraft, the only one of its kind, stands at the deserted shore of the Caspian Sea.

This French chateau is home to the world’s largest private collection of fighter jets.

The last SR-71 ever constructed.

This old KLM airplane cut into three parts was transformed into an eclectic airport gift shop.

Eat your Big Mac in a DC-3.

Watch butterflies take flight before you fly.

This mysterious underground cave in Shropshire dates back to the 18th or 19th century.

A relic of the Cold War tucked away in the forested hills above Bratislava.

One of the first intercontinental ballistic missile sites in the United States.

This deceivingly ordinary warehouse hides an enormous collection of pop culture treasures.

In the loving memory of a tragically deceased role-player this Illinois park is decked out with both dungeons and dragons.