Few things look more out of place than the electric blue ponds in the reddish-brown desert of Utah.

It's safe—and permitted—to walk across these twin natural sandstone arches.

Abandoned medieval hill town.

Once the product of an inexplicable gold strike, this ghost town is now home to one man and his love of classic machines.

The world's largest military aircraft cemetery.

In this small Phoenix taxidermy emporium, you can find everything from a squid in a jar to a freeze-dried toad.

This gallery of prehistoric red ochre art lines the wall of a scenic segment in Utah's San Rafael Swell.

Here, at the "world's longest art gallery," you'll find forty miles of ancient petroglyphs and pictographs.

Ancestral Puebloan ruins, natural arches, and box canyons abound in this seldom-visited corner of Monument Valley Navajo Tribal Park.

This site is home to ancient petroglyphs and pictographs dating back to 6,000 B.C.

A small oasis not far from downtown Moab.

This abandoned, turn-of-the-century astronomy hub is now the subject of more photographs than it ever took.

Despite its grandiose name, this enigmatic first-century void under the town is no cave, and it's possibly not a palace either.

Perhaps the most spectacular grotto along the Algarve coastline.

See massive fossils that are over 200 million years old in northeastern Arizona.

Petroglyphs, bird watching, and a 100-year-old Ranch in one location.

A once-magnificent collegiate church is falling into ruin.

This impressive collection of skulls and bones was gathered by an ex-zookeeper who took advantage of a pig plague.

On the outskirts of a reborn ghost town, a decaying post office remembers the bad old days.

This isolated outpost was once the only place to cross the Colorado River for hundreds of miles.

A planet-hunting astrograph built in the 1920s to seek out the so-called "Planet X" beyond Uranus.

This Arizona observatory is famous for investigations into Martian life, and as the place humans first spotted Pluto.

This rugged area of red rocks and arches is often considered one of the most beautiful places on Earth.

The land is full of geologic eye candy, such as otherworldly spires, mushroom-shaped hoodoos, and prehistoric fossils.