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

This rustic old building is said to be the most photographed barn in America.

The first declared National Monument in the United States.

An architect's childhood fantasy treehouse made real.

This Yellowstone geyser may not shoot as high as the nearby Old Faithful, but it erupts for considerably longer.

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

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.

Hawai'i Volcanoes National Park is home to one of Polynesia’s largest petroglyph fields.

Take shelter from Hawai'i's tropical heat under the massive canopy of largest Banyan tree on the island.

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

This black shoreline is made up of exploded lava particles.

A tunnel of hardened lava along Maui’s famous Road to Hana.

This futuristically sylvan church is a glass-enclosed marvel of modern architecture.

This haunted hotel built on natural springs once served as a hospital for a quack doctor promising a cure for cancer.

An extravagant western hotel where every floor is the "ground floor."

The finest example of Gothic Queen Anne Architecture in the U.S. was built out of rivalry and spite.

Where Elvis Presley received his first Army buzz cut.

This museum is dedicated to the history and design of purses.

The Old Mill shown in the opening credits of “Gone With the Wind” is actually fairly new, and was never a mill at all.

A beautiful botanical garden in the heart of the Natural State.

Mobsters came for a soak in the hot springs, and stayed for the illegal gambling and bootlegging.

Two gushing waterfalls of hot spring water within a block of each other.

This historic hotel on Bathhouse Row in Hot Springs National Park has a storied history of gangsters and baseball greats.