After a short-lived attempt to bring America in line with the rest of the world, this road was left in metric.

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

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

Once America’s most beautiful army base, this abandoned military fort on the coast of Monterey Bay has been left to the elements.

Those with a sharp eye can find the hidden image of a German Shepherd on the memorial's Mural Wall.

Berthed at the Charlestown Navy Yard in Boston, "Old Ironsides" is the oldest commissioned warship still afloat.

This Old West hotel, the longest in continuous operation in the state of Arizona, is claimed to be haunted.

This open-pit mine is now an abandoned symbol of Bisbee's copper-mining heritage.

Out of a desire to feed hungry soldiers, a franchise-altering idea was born.

These elusive, isolated rodents evolved into a distinct, locally iconic subspecies.

Stairs often replace streets on the steep slopes of this old mining town.

Legend says train robbers stashed their gold within the depths of this unusual cave.

Some of the tallest ancient American ruins continue to inspire awe and curiosity.

A spiritual vortex among the red rocks in Sedona.

Thomas Jefferson's estate is home to hundreds of varieties of historic fruits and vegetables.

Not even a series of devastating fires could keep this odd castle in upstate New York from bouncing back.

Explore the largest pure gypsum deposit in the world, and go dune sledding while you're at it.

The last remaining relic of San Francisco's glittering 1915 Panama Pacific Exposition.

One of the most dazzling dioramas at the American Museum of Natural History is also one of the oldest.

Here be dragons.

Surprisingly aquamarine waters fill deep lakes formed at the end of the last ice age.

A small peaceful park and waterfall tucked amid the urban grind of Midtown Manhattan.

Visit the monolithic tomb of America's most famous general.

An antique cemetery in New York, this land is home to any number of famed corpses.