It was once the base for a series of domestic terror attacks.

The 5.5-mile ring of steel posts around the Capitol Building is one of the largest (and most uniform) of its kind in the world.

Look closely and you’ll notice that the color changes a third of the way up the tower.

Washington's iconic carousel has a nice piece of Civil Rights history.

The "lovely red Vega" of the legendary record-settling pilot.

The remains of Martha, the last known passenger pigeon, serve as a tool to educate about conservation.

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

Perhaps the most scandalous statue of America's first president.

Rumor has it the uncarved lump behind the three famous suffragists is reserved for the first woman president.

Home to a vast and influential collection of Shakespeareana.

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

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

A three-story tower of books about Abraham Lincoln is one of the more unusual monuments to the president.

Small and slightly hidden, the American Writers Museum is preserving the legacy of America's finest authors.

The unluckiest U-boat in the entire German fleet is now on display in a Chicago museum.

Fragments of architectural wonders from around the globe are embedded in the newspaper building's walls.

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

The Midwestern United States' tribute to Michelangelo is a foam statue sprayed with gaudy gold paint.

A 70,000-square-foot institution dedicated to a very literal, creationist perspective on the Book of Genesis.

Eight rare Corvettes are swallowed up by a sinkhole in Kentucky's National Corvette Museum.

These structures were inspired by both Native American shelters as well as, strangely, an ice cream shop.

This bizarre hotel on historic Route 66 has been plagued by rumors of paranormal activity.

Hot Doug's "Hot Dog" Stand.

A hot dog stand where the heads are just as hot as the dogs.