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

Ancient pueblos built into the base of a natural canyon wall.

Limestone caves with spectacular showcase chambers.

America's only nuclear missile silo open to the public.

This historic national park is covered in the stunning ruins of red rock pueblos.

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

A reproduction of earth's many biomes.

Ninety feet off the valley floor is an ancient dwelling put under protection of the U.S. government by Teddy Roosevelt.

The first home of the doomed aviatrix Amelia Earhart.

This was the first homestead registered after President Abraham Lincoln signed the Homestead Act into law.

A rancher expanding a natural spring for his cattle came up with bones – lots and lots of them.

When an ancient supervolcano erupted, some of Nebraska's prehistoric animals were forever preserved in ash.

An ornate Art Deco tile mosaic representing Nebraskan life, both modern and prehistoric.

Site of the 1879 Cheyenne Outbreak and the site where famed Sioux chief Crazy Horse met his fate.

This erect, phallic geological spire wasn't always named so domestically.

An overlooked memorial honoring the local Washington residents who died in World War I.

This forgotten boat elevator was an engineering marvel in its heyday.

Legend has it that President Grant’s frequent drinking in the lobby gave rise to the term “lobbyist.”

Members of Congress have traveled between the buildings on Capitol Hill for a century hidden from tourists, press, and storm clouds.

The oldest building in the District of Columbia was preserved because of a mistaken connection to George Washington.

Rumor has it the uncarved lump behind the three famous suffragists is reserved for the first woman president.

The famous abolitionist’s preserved estate is one of Washington's finest monuments to its great Black citizens.

The national park was once a plantation estate.

Fittingly, America's museum of architecture is itself a magnificently designed old building.