The only road through the heart of Glacier National Park.

A beautiful geyser under environmental threat.

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

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

Native Americans built this circle of stones, which was used to predict astronomical events.

The world's largest mountain carving could fit all of Mount Rushmore inside it many times over.

Wedding chapel's mysterious spiral staircase said to be miraculously constructed.

A unique geological area spiked with wind-carved rocks that resemble teepees.

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

Bizarre living fossil only grows in a small chunk of the Namib Desert.

This "dead marsh" sits among the largest sand dunes in the world, a forest frozen in time.

This blowhole is supposedly caused by a trapped monster.

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

Natural sonic phenomenon comes with a grisly legend of murder and blood.

The first declared National Monument in the United States.