A giant Troll lurks under one of Seattle's oldest bridges.

A wall of chewing gum moonlights as collective art.

This public square capitalized on a single Eagles reference to bring some life back to an Arizona town.

Hidden inside this Arizona fast food franchise is an in-depth exhibit on the famed WWII counterintelligence program.

This 4,000-foot-diameter hole is touted as "the most well known, best preserved meteorite crater on Earth."

See massive fossils that are over 200 million years old in northeastern Arizona.

This fast-food outlet is the only space and UFO-themed McDonalds in the world.

At Washington's Dulles Airport is a satellite museum (no pun intended) with three quarters of a million square feet of aircraft history.

This isn't your average roadway—it's actually a National Park and a transportation pioneer.

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

"Congress may voluntarily remain in session throughout the summer, in order that our Congressmen may be protected from the intolerable discomforts and dangers of the ordinary outdoor weather!”

At 207 feet, one of the world's longest continuous escalators.

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

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

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

A 19th-century Gothic, castle-like statehouse by the Mississippi River.

The LSU mascot lived on the college campus in one of the most impressive tiger habitats in the country.

Formerly known as National D-Day Museum, this collection commemorates the battles of Normandy and WWII.

By day this New Orleans square is for pedestrians, but by night it is a kingdom of kittens.

This historic train station has been converted to a locomotive themed hotel.

One person's lost luggage is another person's treasure.

Monument to the cotton-destroying boll weevil.

The highest point in Tennessee, Clingmans Dome bears witness to the ravages of one type of insect.

Walk the whole Mississippi River!