Lady Liberty's first beacon of enlightenment is now displayed in a museum near the statue.

A historic and oft-filmed prison stands in a Chicago suburb.

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

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

A spiritual vortex among the red rocks in Sedona.

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

A Wild West jailhouse that slid down the mountainside.

An urban laboratory.

This 40-room dwelling tucked within a cliff was built by the basin's prehistoric residents.

The unusual burial monument of Arizona's first governor.

A Depression-era sculpture by Charles Umlauf survives in a small suburban post office.

This cave holds a surprisingly colorful variety of geological oddities.

This house renovated by Frank Lloyd Wright was the centerpiece of a lavish 20th-century estate.

Cold War missile launch site which has been converted to a public park.

Wisconsin's most celebrated export gets the royal treatment on I-94.

Behind a modern brick exterior lies the oldest continuously-operating lunch-car diner in the United States.

This abstract sculpture is rumored to cast a hammer-and-sickle shadow once a year.

A 400-foot-tall tall map of Chicago makes this once-ignored building stand out.

This bronze sculpture on a former squash court marks the secret origins of the Atomic Age.

This historic-shipwreck-cum-diving-spot can still be seen poking its boiler out of the Lake Michigan waters that claimed it.

This surprising gem is a world-class archeological museum hidden at the University of Chicago.

The most decorated dog of World War I is preserved in the Smithsonian.

The monument's pointy aluminum tip has been melted down by repeated lightning strikes.

Daredevil repair workers can worm their way out the access hatch, loop ropes over the apex and rappel down the monument.