A stretch of highway even lonelier than the so-called "Loneliest Road in America."

An eatery for UFO seekers on the Extraterrestrial Highway.

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

The last SR-71 ever constructed.

A building so large that it has its own weather.

Mysterious meeting place for UFO hunters near Area 51.

Dedicated to the victims of one of the deadliest hurricanes to strike the United States in recorded history.

At the time of its completion, it was the tallest dam in the world.

In the middle of an extremely unforgiving and desolate high desert is the most secret military facility in the world.

Come for the speed, leave in love with the desert.

Officially named the "Loneliest Road in America," this barren stretch of Nevada road offers almost nothing but sky and open fields.

A tree bears footwear on the loneliest road in America.

A monument celebrating the idea of reaching inaccessible places.

The former home of the Nobel Prize-winning American writer is now home to dozens of six-toed cats.

A sliver of nostalgia in Seattle's Viretta Park.

Every equinox this Maya pyramid puts on a spooky ancient light show.

A magical sinkhole on the Yucatán Peninsula is adorned with mini waterfalls and hanging vines.

The world's most remote airport.

The largest stone moai on Rapa Nui.

This fairytale house on the shore of a Chilean Lake oozes an eclectic mix of Chilote and German Cultural heritage.

Legend has it the commander of the defenders drew a fateful line in the dirt with his sword just before the final battle.

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

No telescopes, no power, no gift shop: The Observatory of Chichen Itza, one of the world's oldest observatories, takes astronomy back to basics.

This Old West eatery along America's Loneliest Road was originally a stop on the Pony Express.