The ancient dwellings of the Puebloans, located in the cliffs of majestic mesas.

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

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

A house carved into a rock in the 1940s.

The location where the iconic movie character declared it was time to go home.

This balancing rock is one of Utah's most unusual geological formations.

Oddly shaped rock formation, misassociated with a nearby utopian community.

One of the world’s largest collections of petroglyphs records 2,000 years of human activity.

This presidential tomb was not dedicated until years after Harding's death due to personal controversy.

America's post-nuclear-attack chambers of Congress.

The world's largest fully steerable radio telescope.

This rural community has attracted both scientists and techno-refugees due to its federally-mandated lack of technology.

The hulking remains of the Leesburg Lime Company Kiln lie dormant behind a historical marker close to the W&OD trail.

The largest cemetery for enslaved people in Loudoun County was almost lost to history, if not for the research of a minister.

This pun was simply waiting to come to life, and one defense contractor made it so.

At Washington's Dulles Airport is a satellite museum (no pun intended) with three quarters of a million square feet of aircraft history.

These unusual rooms on wheels are holdovers from the 1960s.

An oft-overlooked, magically musical monolith that stands majestically between Arlington Cemetery and the Iwo Jima Memorial.

The preamble to the U.S. Constitution written entirely from vanity license plates hangs in the Smithsonian museum.

An atomic bomb-proof strongbox protects the U.S. Constitution from terrorists and thieves.

A much-maligned monument to teetotalism.

An echo chamber with a waterfall wrapped around its base at the Embassy of Canada in Washington, D.C.

It was once the base for a series of domestic terror attacks.

A spectacular tribute to statesman and philanthropist Andrew Mellon.