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

One of the oldest living oak trees in the Southeast.

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

When ecosystems collide in the arid Southwest.

Dyed by iron oxide over centuries, these sandstone rocks rise thousands of feet into the sky.

The highest bridge in America was built for an almost unnervingly small amount of money.

An homage to everyone's favorite prehistoric cartoon family.

A clear blue swimming hole with hidden caves, still unexplored.

Canyon walls shrouded in ferns.

New Orleans' famous cemetery, located on the site of a former race track.

See massive fossils that are over 200 million years old in northeastern Arizona.

One of the most scenic stretches of road in America winds between some of the country's oldest trees.

Rustic natural hot springs in the deciduous rain forest.

A pedestrian island in the middle of world-famous Times Square emits a strange (and purposeful) humming noise.

The largest self-built castle in the U.S., six decades in the making.

Florida might be at its most surreal in this museum devoted to the famed Spanish artist.

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

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

A beautiful geyser under environmental threat.

Odd outsider art installations surround a Gold Rush-era ghost town.

The first declared National Monument in the United States.

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

A walk through the historic city center, under the streets of Seattle.

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