Railroad officials in the early 1900s sought to spare travelers the sight of Roman soldiers’ private parts.

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

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.

The discovery site of the "Capitalsaurus," the official dinosaur of Washington, D.C.

A museum cafe showcases Native American dishes and indigenous ingredients from across the Western Hemisphere.

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

A "gravitational anomaly" located in the redwood forests just outside of Santa Cruz, California.

Built for an exposition in 1915, these horticultural displays have stood the test of time.

One of the largest trees of its kind in California.

The world's largest outdoor organ is played weekly by one of just two civic organists in the U.S.

An extraordinarily ornate museum in San Diego holds wondrous anthropological treasures.

A monumental statue of RCA's mascot now sits atop a historical society roof after a life of moving around.

This simple convenience store sits on the location where the Ouija board was named—and has a plaque to prove it.

The trials and tribulations of marking Poe's grave.

It's not hard to see why the historic Peabody Conservatory of Music's library has been described as a "cathedral of books."

A museum dedicated to exhibiting remarkable outsider art.