Once thought to be the oldest living tree in the world, Methuselah was germinated before the Egyptian pyramids were built.

The most alien-looking place on Earth.

The largest earthwork effigy in the world.

Natural time capsule containing an alien ecosystem.

Breathtakingly blue walls shimmer inside the "Glacier Behind the Town."

The world's longest known cave system.

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

Walk 2,300 feet above the ground on the "Troll's Tongue."

The installation’s official name, “You Who Are Getting Obliterated in the Dancing Swarm of Fireflies,” says it all.

A stunning, two-tiered waterfall made famous by poets, artists and the legend of a ghost dog.

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

This volcanic cave lake is essentially hard proof that Iceland is the most magical place on Earth.

A Hawaiian stairway to heaven—that you can't climb.

Carved by a waterfall in a hard-to-reach rock formation, this heart-shaped rock has inspired romantics for decades.

An abandoned stretch of highway, deteriorating next to the operational one.

Hellam Township is reputed to feature seven remote gates, which when passed through in the right order, open an entrance to hell.

This fantastical waterfall is hidden in a cave located in a cracked cliff.

Every autumn, this hillside is ablaze with red summer cypress.

A natural gas leak provides a flickering flame beneath a waterfall.

The longest continuous lava tube in the continental U.S. offers 2.5 miles of dark explorations for the adventurous.

Keshwa chaca, among the last handwoven Incan bridges, crosses Apurimac Canyon in Peru.

A beautiful geyser under environmental threat.

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

This 4,000-foot-diameter hole is touted as "the most well known, best preserved meteorite crater on Earth."