These sub-farmland caves are home to a majestic stalactite known as the "Crystal King."

A larger than life statue of a steelworker keeps watch over a closed steel mill.

A dramatic, 360-degree recreation of Pickett's Charge in the Civil War.

How did a former First Lady's tiara wind up being sold to a pawn shop on reality TV?

The first declared National Monument in the United States.

Hollywood's most famous landmark, the "temporary" sign that has stood for decades longer than intended.

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

The farm toy capital of the world hosts a museum filled with toy tractors dating back to the late 1800s.

Scores of vintage street lamps shine along L.A.’s Miracle Mile.

This artsy public restroom is shaped like a giant john.

A traveling postal dog covered 48 states and more than 140,000 miles, and he lives on as taxidermy, patched up with a rabbit's foot and a pig's ear.

The largest burial mound in the United States holds the remains of prehistoric West Virginians.

Beyond the usual stories that attend old prisons, this one has deep bloody undercurrents.

An office built to look like a giant basket.

Ohio's 19th-century communist micro-society.

The site of Neil Armstrong's first flight is marked by a full on replica of the moon landers.

The world's largest Our Lady of Guadalupe statue overlooks this Ohio sanctuary.

A monument to the “unrecognized dead” of the tragic 1876 train crash.

Ghost stories surrounded this “castle,” the only structure from a huge mansion that was never built.

This quirky UFO-shaped curiosity is often mistaken for the airport’s control tower.

These delicate buggers are some of the rarest fossils that have bubbled up from the Tar Pits.

The actual model from the original "Star Trek" series is now on display at the National Air and Space Museum.

This enormous banquet-themed artwork honors over 1,000 notable women throughout history.

Each of these gorgeous, intricately decorated rooms is painstakingly crafted to the scale of 1 inch: 1 foot.