The only road through the heart of Glacier National Park.

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

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.

This rare example of a "tidefall" is a spectacular drop from the cliffs down onto the beach.

This Big Sur waterfall drops 80 feet directly into the Pacific Ocean, and inspired the hillside house up top.

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

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

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

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

The soaring gondola lines form the longest aerial cable car system in the world.

Popular tourist destination where witches in dark hats sell dried llama fetuses for good luck.

The beauty of urban decay, hiding some dark secrets.

San Francisco Bay's ghost town.