One of the Seven Wonders of the Modern World holds the world's tallest metal staircase.

A second generation sun-powered marvel lights up the night.

An historic and oft-filmed spot for musclebound iron pumpers on the Pacific coast.

The park is home to the United States's only still-operating Dutch windmill.

This is the last hand-cranked chain ferry of its kind in operation in the United States.

One of nature's most well-scheduled phenomenons resides in Wyoming's Yellowstone National Park.

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.

The giant squid's 27-foot-long corpse lies preserved within a Sarasota aquarium.

A building so large that it has its own weather.

An idyllic swimming pool tells the tale of Hemingway's trouble with women.

The former home of the Nobel Prize-winning American writer is now home to dozens of six-toed cats.

A monument celebrating the idea of reaching inaccessible places.

A theme park attraction designed to turn your children into LARPers.

A large circus museum with summer performances.

This cave holds a surprisingly colorful variety of geological oddities.

A bizarre house filled with an astounding array of collections.

A sign at the end of the Santa Monica Pier marks the traditional end of the legendary American highway.

A place to eat for on-the-run agents and espionage enthusiasts.

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

These pretty kitties killed and ate as many as 135 railway workers.

The twin towers in this Chicago fountain use 50 foot tall video screens to spit on people.

Chicago's Navy Pier on Lake Michigan was a training hub for aircraft carrier pilots during WWII.

A display of magnificent stained glass windows is the first exhibit of its kind.