Unrepaired walls from a 1920 anarchist bomb attack.

This mosaic dedicated to John Lennon was tended for years by a Beatles super-fan.

This cemetery has graves dating back to the 17th century, including the city's oldest carved tombstone and an ominous cryptogram.

This elaborate towering structure was once famed for its revolutionary height.

Huge masonic hall in Philadelphia with lavishly themed rooms.

This charming colonial alleyway is one of the oldest continuously used residential streets in the U.S.

Fantastic collection celebrating the final send-off.

A breathtaking array of ancient Pueblo structures and artifacts counterintuitively preserved by neglect.

The only royal palace on U.S. soil has been a territorial capitol, a military headquarters, and a prison for a queen.

Making Ice Cream Hip Since 2008.

A museum dedicated to restoring vintage aircraft, located at a working airport.

Pillars made of 700 pieces of luggage climb to the ceiling of Sacramento Airport's baggage claim.

A massive hydrovolcanic explosion left a half-mile wide crater in Death Valley.

This crumbling Death Valley mining complex was known for its use of giant, 20-mule team wagons.

One of the largest trees of its kind in California.

A remote crossroads honoring a fallen talent.

This Southern Californian Conservation Center is home to singing and howling apes.

A massive volcanic plug is now a protected area that hosts a number of bird species.

This giant temperature attraction created some giant electric bills.

One of the largest helium balloons in the U.S. is a 112-foot ginormous orange.

This enormous World War II relic is one of the largest wooden structures in the world.

Marta Becket's hand-painted theater in the desert.

Once America’s most beautiful army base, this abandoned military fort on the coast of Monterey Bay has been left to the elements.

A sculpture of the famous photograph stands on San Diego's "Greatest Generation Walk."