These otherworldly formations were shaped over millions of years by the forces of nature.

Planned as the world’s first zero-carbon city, it had lofty ideals—but is only 5 percent completed and aiming for 50 percent carbon-neutral.

This massive piece of artwork weighs more than 250 tons, and was designed as a tribute to the first president of the United Arab Emirates.

Whitewashed mosque contains the world's largest carpet.

A seemingly desolate park that belongs to two countries actually supports all kinds of wildlife.

A rare cluster of alien-like plants grows along a dusty highway.

Known as "The People's Park," this verdant oasis is home to elephants and villagers alike.

This exquisite example of early colonial architecture remains unfinished almost 500 years after construction began.

An island filled with hundreds of hanging, decomposing, decapitated dolls.

Explore the atmospheric ruins of an abandoned convent in the dense forests of Mexico's first national park.

A rustic place to spend the night, complete with amazing quiver trees and outsider art.

The remains of diamond fever taken over by the desert.

Unexplained bald patches in the landscape grow and recede over time, as though they are somehow alive.

This "dead marsh" sits among the largest sand dunes in the world, a forest frozen in time.

This stately bank building hides a spectacular star-studded ceiling.

The colorful stairs are made with marble from the world's major quarries.

The tomb of one of Scotland's bloody historic villains is a magnet for bumbling desecrators.

Ruined 11th century abbey built by King David I in Edinburgh, Scotland.

A unique waterfall that some believe attracts the fairfolk.

A spring water stream jumps through a walkable "bridge" cavern and a narrow canyon.

Warm water springs inside an astounding canyon.

One man's personal collection of more than 2,000 creepy-crawlies from around the world.

The English graveyard of Mineral del Monte, a magical little piece of Cornwall in Mexico.

These colonial murals are a fascinating hybrid of Spanish and Indigenous aesthetics.