Millions of dollars worth of sculpture decorate this Iowa city center.

The world’s largest truck stop includes a barber shop, chiropractor, and a huge museum with antique trucks.

A four story, football field-sized, nine-grotto creation made of shells, minerals, and rare stones.

The headquarters of the prestigious World Food Prize celebrates the heroes in the fight against hunger, has no cafeteria.

Lured here by the promise of tens of thousands in gold, Jesse James started a quintessentially American trend of robbing trains in-motion.

A harem-inspired Moorish fantasy design in a Victorian-era Welsh castle.

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.

One critic described it as "middle Mussolini, early Ramses, and late Neiman-Marcus." Another called it an architectural "natural disaster."

An obscure federal monument honors the French diplomat who served as Ambassador to the U.S. during WWI.

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

While most wind tunnels test scale models, the "Cave of Winds" was large enough for actual airplanes.

The fountains of the U.S. Navy Memorial are annually salted with water from the Seven Seas as part of a nautical ritual.

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

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

An atomic bomb-proof strongbox protects the U.S. Constitution from terrorists and thieves.

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

The beloved statue at the National Academy of Sciences is oh so inviting to sit on.

There's a 12-foot-tall replica of the Washington Monument hidden under a manhole nearby.

Home to items never before seen by the public.

The site of the climactic scene from the classic horror film is now a historic landmark.

This aircraft museum is home to one of just three Halifax bombers in the world.

This memorial to World War II's fallen airmen shows us the movements of the stars that once guided them.

The National Railway Museum in York is the largest railway museum in the world, attracting almost 1 million visitors per year.

Astonishing rock formations dot the Brimham Moor landscape.