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

US-50 in Nevada is known as "the Loneliest Road in America," but this earlier iteration of the route is even lonelier.

This sign designates the road that leads to the infamous Area 51.

The self-made house sculpture of an outsider artist who named himself "Chief Rolling Thunder."

Mysterious meeting place for UFO hunters near Area 51.

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

An eatery for UFO seekers on the Extraterrestrial Highway.

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

Dyed by iron oxide over centuries, these sandstone rocks rise thousands of feet into the sky.

A classic theatre located along a desolate Montana road.

This amazingly preserved Gold Rush town is a historian's dream.

A popular rock that acted as a waymarker for American pioneers.

This Yellowstone geyser may not shoot as high as the nearby Old Faithful, but it erupts for considerably longer.

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

The largest hot spring in the United States is, as the name suggests, a stunning show of natural color.

A beautiful geyser under environmental threat.

The first declared National Monument in the United States.

Despite monuments in other locations, this spot in a South Dakota field is recognized by the U.S. National Geodetic Survey as the center of the 50 states.

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

One of the "twins" in these falls on the Snake River was sacrificed for hydropower generation in the 1930s.

Where the famed daredevil attempted to launch himself across a canyon in a custom-built rocket.

Supposedly Satanic numbers adorn this preserved submarine sail.

Home to the deepest rift anywhere on Earth.

Quito's historic, main square dates back to the 16th century.