This quirky UFO-shaped curiosity is often mistaken for the airport’s control tower.

Watch the newest land on the planet form before your eyes.

A beach made of semi-precious green sand on the Big Island of Hawaiʻi.

This black shoreline is made up of exploded lava particles.

Earth's tallest volcano is sacred to Native Hawaiians, and home to a dozen world-class observatories.

Climbing this abandoned railway leads to breathtaking vistas of O‘ahu.

The last remaining relic of San Francisco's glittering 1915 Panama Pacific Exposition.

Beneath the southern end of the Golden Gate Bridge is the “Gibraltar of the West Coast,” a fort built to protect the San Francisco Bay from naval attack.

Abandoned bridge hidden deep in the San Gabriel Mountains.

The remnants of a failed socialist commune can still be found just off a California highway.

An abandoned 1930s gas station turned bustling neighborhood park.

Don't bother sending any mail to this ghost town.

A monument is dedicated to the thousands of people who pick and harvest our nation's food.

Make sweet music as you walk through this interactive sonic sculpture.

This massive stained-glass masterpiece is thought to be the largest Tiffany dome in existence.

This alley in downtown Chicago held the bodies of over 600 people after the fateful Iroquois Theatre fire.

A gothic church spire sits atop this skyscraper, the tallest church in the world.

A British pub embodies the spirit of a California legend.

A Masterpiece with a Tragic History.

An L.A. traffic island where the faces of locals have been carved into massive granite eggs.

Mural made of 100,000 pieces of hand blown glass, and one of the largest glass murals in the US.

The largest body of water in Massachusetts annihilated four small towns just to slake Boston's thirst.

A beloved Chicago music venue offering cold beer and lots of “Friendly."

This nondescript tunnel has been featured in a number of iconic movies, from “Roger Rabbit” to “Back to the Future.”