This metal disk commemorates the birth of a historic American holiday.

The beautiful 1920 Pantages Theatre remains hidden just underneath the LA Downtown Jewelry Exchange.

The space-age building is home to one of the few remaining rotating restaurants in America, and the only one that inspired a 1980s sitcom.

An iconic location along the Los Angeles River where countless movie scenes are filmed.

Opened as part of the New Deal, the training facility now features World War II-era structures and a pylon that once stood at the World Trade Center.

Historic funicular railway, believed to be the shortest railroad in the world.

The legendary building that needed ghostly approval before being built.

A visionary, futuristic sculpture in Los Angeles that never met its extraterrestrial potential.

This iconic L.A. bookshop is housed in an abandoned bank—both symbolic and chic.

New York's unstoppable progress turned this cemetery into the smallest burial ground in the city.

The only natural lake in the world that drains into both the Atlantic and Pacific Oceans.

Touch an actual dinosaur bone at this eclectic trove of Rocky Mountain treasures.

These experimental weapons brought World War II to Nebraska as well as 26 other U.S. states.

This roadside attraction has been serving out its fair share of hearty folklore and chaos since 1858.

This bright yellow relic is the final survivor of a short burst of seashell-shaped petrol pumps.

Narrowest house in Boston.

Venice's "Island of the Mad."

A computer bug so primitive it was an actual insect.

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

A hugely vast Irish landscape of barren rock that stretches for miles.