The magic's in the hole!

The largest hot spring in the United States is, as the name suggests, a stunning show of natural color.

Each year these high desert hills are absolutely covered with poppy flowers in a surreal show of nature.

A beautiful geyser under environmental threat.

An underground mansion with fruit-bearing trees and grapes growing beneath the surface of central California.

The first declared National Monument in the United States.

The deepest lake in the United States, and once the site of epic destruction that lives on in legends.

The site of the climactic scene from the classic horror film is now a historic landmark.

For two weeks every June, fireflies in the Smoky Mountains perform an astonishing light show.

A roaring, awe-inspiring double cascade of icy water flows through woodland Oregon like something out of a Tolkien novel.

Elevated freight railway turned wildly successful urban park.

The abandoned zoo enclosures offer a perfect place to experience the other side of the bars.

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

An artsy hidden staircase leads to breathtaking views of San Francisco.

Heralded as the world's first theater, these ruins are often overlooked as they reside in the shadows of the Acropolis.

This 15th-century island fortress later served as home to the executioners no one wanted to live near.

A quirky bookstore hidden beneath a sea of whitewashed Greek villas.

A Bronze age settlement on the Greek island of Santorini might have been the inspiration for Plato's Atlantis.

This legendary city has been a tourist attraction for centuries.

The hallucinogenic center of the ancient world.

The spur that wouldn’t die.

42nd story Pyramid shaped penthouse tops Seattle's oldest skyscraper.

Residents of Fremont in Seattle have considered it the center of the universe since the 1970s.

The tech giant built three enormous glass orbs in Seattle so employees could work inside a rainforest greenhouse.