A tiny piece of the Moon is embedded in this stained glass masterpiece.

Aqueducts have dramatically changed this old lake, now home to tufa towers and its very own species of tiny brine shrimp.

The trials and tribulations of marking Poe's grave.

Quite simply the largest tree in the world (by volume).

Seattle's own bad art museum located inside Cafe Racer.

The magic's in the hole!

A museum dedicated to the alleged Roswell Incident.

A huge musical sculpture and other art installations on the National Oceanic and Atmospheric Administration grounds.

The second-largest cave chamber in the world was discovered in 1898 by a 16-year-old and a friend known as "Pothead."

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

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

Whisper secrets in a busy station only to be heard on the other side of this acoustic arch.

This frequently-photographed waterfall takes only a short hike to visit.

Ninety feet off the valley floor is an ancient dwelling put under protection of the U.S. government by Teddy Roosevelt.

A beautiful geyser under environmental threat.

The ghostly remains of an accidental sea.

The first declared National Monument in the United States.

Stepping away from the glitz of mobsters and casinos to learn about the other history of Vegas.

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

Stroll through a wonderland of stupendous moss-covered trees.

A 200-year-old bar in the historic French Quarter refuses to give up its place in history, nor its role in securing ours.

Explore the largest pure gypsum deposit in the world, and go dune sledding while you're at it.

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

Under the right circumstances, this waterfall in Yosemite briefly turns a luminescent fiery orange.