This raised bulls-eye visible from space was the subject of an intense geologic controversy.

In the heart of Brigham Young's promised land sits a festering plot of industrial ruin that has been claimed by society's outcasts.

An absolutely beautiful 200-foot stained glass installation traces the evolution of knowledge.

Visitors to this library are in for a real-world education in modernist architecture.

A chessmaster's dream destination.

The Old Courthouse takes visitors on a captivating trip through St. Louis' timeline.

A 35-foot-tall fork stuck in the ground outside an office building in Missouri.

Over 600 vacuum cleaners stack the shelves of what may be the cleanest museum in America.

The world's largest dead polar bear, immortalized by taxidermy and Hunter S. Thompson.

Less a museum than a bizarre fantasy world created by artists and engineers.

This abstract roadside poultry was saved from demolition by outraged drivers and pilots.

One of the most influential presidents in U.S. history wanted only this plain, elegant monument as his lasting memorial.

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

This stunning blue and gold room changed cities twice before becoming part of the Smithsonian.

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

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

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

A unique geological area spiked with wind-carved rocks that resemble teepees.

Strange red rock formations that have been attributed to a higher power for hundreds of years.

Prehistoric animals decorate this popular outdoor park.

The world's longest known cave system.

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

Nature's biggest mammal swims in landlocked Oklahoma.

The third tallest lighthouse in America once guided author Stephen Crane to safety.