A little-known subterranean street runs under some of the best-known buildings in Chicago's River North.

Four glass boxes hover over 1,000 feet in the air to give visitors an unparalleled view of Chicago.

An obsolete, vanishing traffic device warns Cincinnati drivers away from middle-of-the-road obstructions.

The remains of this hell for leather wild west town can still be found in the Arizona desert.

The highest point in Arizona is an oddly snow-topped peak within the otherwise arid state.

Giant, natural amphitheaters made of delicate geological formations called "hoodoos."

The giant pair of sexy legs sticking out the window of this costume store have become its main draw.

This memorial pyramid marker honors one of the United States Government's first official camel riders.

A Saint Nicholas-themed ghost town in the Mojave desert.

This historic tower in the California desert promises visitors a "vortex of good vibes".

The oldest lighthouse on America's west coast no longer needs keepers, yet they maintain the site anyhow.

Every year, over 25,000 monarchs overwinter in Pacific Grove.

Haunting and beautiful trees, doomed to die.

Two rocks in a perpetual kiss and one of "the most romantic spot in America."

Steinbeck's old stomping grounds, immortalized in Cannery Row.

Fake rail crossings mark the site of an influential doctor's demise.

This eagle-topped spire remembers the military commander who snatched up California for the United States.

The stately birthplace of California's statehood.

An old whaling station now serves to give the public a look at the commercial whaling industry, no longer a part of Monterey's economy.

This remarkably simple jail went over a century without an escape.

The first safe in this California town had to hold all the gold.

A tree grown from astronaut seeds which were exposed to cosmic rays.

The oldest U.S. Government building in California, and it's State Historic Landmark #1.

This municipal playground was co-created by the father of one of the most playful characters ever.