A popular swimming hole that hides one of America's most deadly diving spots.

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

A bizarre roadside attraction and the first instance of miniature golf in the world.

Stripes of flowers bloom each spring in a 50 acre rainbow of color.

Brightly colored 30-foot-tall totems light up the desert sky just outside Las Vegas.

Experience a quartz crystal sound bath inside a storied, all-wood sound-chamber.

Outsider Art Community.

Canyon walls shrouded in ferns.

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

Breathtakingly blue walls shimmer inside the "Glacier Behind the Town."

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

San Francisco's newly reopened hands-on science museum.

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

Olfactory delights in San Francisco's Botanical Gardens.

A beautiful geyser under environmental threat.

A winding path built in secret on the edge of the continent.

Under the right circumstances, this waterfall in Yosemite briefly turns a luminescent fiery orange.

On the Oregon coast there is a natural hole that seems to be draining the sea.

Nine limestone rock stacks on Australia's "Shipwreck Coast."

A clear example of the process of erosion in action.

Woven tree art gives this towering Australian woodland a touch of mystical whimsy.

A castle hand-built by a Spanish dreamer in the Australian tropical jungle.

Australian Lake set aglow by Noctiluca Scintillans.

A crumbling cliffside ruin hidden in the woods.