Over 20,000 sets of spice shakers reveal the surprisingly telling history of our most basic spices.

The secret city built by the Manhattan Project.

This blowhole is supposedly caused by a trapped monster.

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

A series of waterfalls and pools that flow through the 'Ohe'o Gulch and into the ocean.

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

Earth's tallest volcano is sacred to Native Hawaiians, and home to a dozen world-class observatories.

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.

One day a year it is legal to jump off of this astoundingly tall bridge that spans an Appalachian gorge.

Shoreline strewn with the remains of ghostly fallen trees.

A museum dedicated to the history and exploration of both popular music and science fiction.

An organ located deep within a cave, whose "pipes" are the geological features of the cave itself.

A sacred site for Native Americans surveyed by George Washington and owned by both King George III and Thomas Jefferson.

A forest wonderland caused by Burlington, Vermont's aggressive southwestern winds.

Oddly shaped rock formation, misassociated with a nearby utopian community.

This rugged area of red rocks and arches is often considered one of the most beautiful places on Earth.

Giant, natural amphitheaters made of delicate geological formations called "hoodoos."

Bizarre lunar-like landscape with thousands of large stone "hoodoos."

One woman's Viking Castle on Lake Tahoe.

The lowest point in North America is home to an undrinkable pool surrounded by fields of geometric salt flats.

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

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