This giant iron playfully pays tribute to an early 20th-century architectural trend.

This historic tower in the California desert promises visitors a "vortex of good vibes".

A UFO scrapyard in the California desert.

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

Standing in a state of "arrested decay," this ghost town allows for a detailed peek into Gold Rush life in an unusually harsh climate.

This historic graveyard was partially paved over to create a streetcar line.

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

Not truly a ship nor a building, the Navy's first and last "landship" is now abandoned due to clerical issues.

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

San Diego's most historic and haunted home.

Behind this beachfront shop lies a spectacular, colorful sea cave with an equally colorful past.

The hidden jewel of Disneyland: a members only playground for the Disney elite.

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

A nostalgic bibliographic gem.

One of the Seven Wonders of the Modern World holds the world's tallest metal staircase.

The bank that helped fund the Mexican-American War and the purchase of Alaska met its downfall after helping Augusto Pinochet launder money.

A 1,100-ton train fell through the floor in 1953. Workers got it patched up in just 72 hours.

A derelict bit of infrastructure from the canal that once ran through D.C. is landlocked in the heart of the city.

A fantastic array of trays and cables once whisked books over to the Capitol at 600 feet per minute.

A heroic pigeon that, through a barrage of gunfire, delivered a message that saved over 100 lives in World War I.

You could be standing at the site of one of D.C.'s most fatal tragedies and not even know it.

The most decorated dog of World War I is preserved in the Smithsonian.

The oldest building in the District of Columbia was preserved because of a mistaken connection to George Washington.

A line of blue paint marks the route of the inaugural parade.