An alley covered with 20 years of bubble gum.

Thousands of migrating monarchs overwinter clustered amongst the eucalyptus trees.

The dramatic upward-curving roof is one of the most iconic examples of Googie architecture that still stands today.

The show's fictional Korean medical camp was created in the Santa Monica hills.

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.

Coastal dunes, site of buried Egyptian movie set and former utopian colony.

A burnt orange monolithic dome structure perched on a hillside near Interstate 280.

The interior of the Overlook Hotel in "The Shining" was based on this Yosemite original.

Home to the "Circus" trees created by Axel Erlandson.

Community bookshelf of 25-foot-tall book spines.

A plaque marks the site directly below the mid-air detonation of the atomic bomb over Hiroshima.

This former Texas landfill is flush with 300 million-year-old fossils, all fit for the taking.

Berthed at the Charlestown Navy Yard in Boston, "Old Ironsides" is the oldest commissioned warship still afloat.

The first green space constructed on an elevated viaduct.

The granddaddy of all tourist traps, built on ice water, jackalopes, and a giant dinosaur.

A small flooded ghost town with a few scattered structures remaining.

The American Revolution was galvanized into serious action due to the tragic clash with British soldiers that occurred at this location.

A massive sea stack famous for its appearance in The Goonies.

The marker offers a rare chance to be in four U.S. states at once, though there's some controversy over its geographic accuracy.

The unbelievably opulent home built for an infamous newspaperman.

The largest drain hole in the world.

One of nature's most well-scheduled phenomenons resides in Wyoming's Yellowstone National Park.

1,001 carved statues of the Buddhist God of Mercy, each with a unique face.

An "inside out" building in the historical center of Paris, featuring Europe’s largest modern art museum.