These ruins of a pre-Columbian cliff village are among the most beautiful and well preserved in New Mexico.

The Denver airport is guarded by a 32-foot-tall sculpture of a demonic horse.

A striking 12th-century-style castle built on the edge of a cliff.

Standing in a state of "arrested decay," this ghost town allows for a detailed peek into Gold Rush life in an unusually harsh climate.

This black shoreline is made up of exploded lava particles.

The unbelievably opulent home built for an infamous newspaperman.

Dig for your own trilobites in this goldmine of invertebrates.

A marvel of Byzantine engineering under the streets of Istanbul.

Every day a troupe of pampered water fowl walk the red carpet to their favorite fountain.

A massive sea stack famous for its appearance in The Goonies.

An encyclopedic collection of mammal penises.

A chain of 16 wondrous lakes formed as a result of the gradual dissolution of soluble layers of bedrock.

Only known mainland rookery of the threatened Stellar sea lion.

Legends surround this jagged rock formation in the New Mexico desert.

This massive redwood tree has a hole in the base big enough to drive through.

The marker offers a rare chance to be in four U.S. states at once, though there's some controversy over its geographic accuracy.

Monasteries on rock pillars, once accessible only by frayed ropes.

Copenhagen's celebrated theme park and gardens.

Constant erosion has created a surreal landscape of bleached and preserved fallen trees.

Aqueducts have dramatically changed this old lake, now home to tufa towers and its very own species of tiny brine shrimp.

This unreal Portuguese palace looks as though it's made from a pile of different castles.

One of nature's most well-scheduled phenomenons resides in Wyoming's Yellowstone National Park.

These aggressively sustainable art homes look like something out of 1970's science fiction.

The world's largest mountain carving could fit all of Mount Rushmore inside it many times over.