The ancient past meets the retro-future at these dinosaur tracks that are protected by a geodesic dome.

This prehistoric sinkhole lured exclusively male mammoths to their death, much to the delight of science.

Other-worldly rock formations and ancient fossils abound in this unique stretch of Nebraska badlands.

This stone complex marks the urban center of a lost civilization.

The remains of what was the most important religious complex in coastal Peru for over a millennium.

The depictions of slaughter are surprisingly detailed at this mysterious ancient site.

A mysterious pre-Incan ruin believed to have miraculous healing powers.

This scalding hot river was thought to be a myth until one geoscientist made it his quest to study the mystical waters.

The largest hewn stone in history.

Roman ruins top white travertine terraces formed by ancient hot springs.

A fantastic castle rumored to be the birthplace of King Arthur.

This volcanic cave lake is essentially hard proof that Iceland is the most magical place on Earth.

Stalactites and stalagmites in a beautifully lit cave.

A Hawaiian stairway to heaven—that you can't climb.

A gargantuan crystal kingdom.

The atmospheric road was never meant to be so creepy.

Famously misunderstood wonder of the ancient world

A seemingly endless landscape of pure salt stretches far across Bolivia.

The sound of swaying stalks in this stunning grove has been named a governmentally recognized sound.

Mother Nature outdoes herself with this stunningly beautiful set of caves carved into marble.

A lovers' beach, tucked below the surface of the island, provides a safe haven for romance.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

This massive chalk hill carving is one of England's most beloved giant horse geoglyphs.

Carved by a waterfall in a hard-to-reach rock formation, this heart-shaped rock has inspired romantics for decades.