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

A secret, rocky playground hidden amongst the plain white beaches of the Florida coast.

Erosion has transformed this sandstone boulder into a massive dune-filled cavern.

Harder layers in colorful sandstone weather out as prominent “fins" and even more intricate and bizarre shapes.

An unexpected sinkhole in a desert flat within Gold Butte National Monument.

Often referred to as the largest spring in America.

Greenery covers the face of a gently-dripping waterfall deep in the mountains of central Sardinia.

At the most northwestern point of the contiguous United States lies a trail leading through an ancient forest to stunning cliff-side vistas and massive oceanside caves.

A modern mechanical planetary system, part of a 10,000 year clock.

There is no trying to fall in love with this Star Wars fountain, you just do or do not.

Carnivorous plants, medieval aphrodisiacs, and the largest original wood structure glass conservatory in the western hemisphere.

Rippling sand dunes frozen in the Arizona rock.

The final resting place of a space program monolith.

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

San Francisco's urban bison herd has persisted in the face of extinction, development, and disease.

Trails through lava-carved tube-caves display sparkling bacteria and a rich history.

Canyon walls shrouded in ferns.

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

A huge musical instrument played by the ocean.

Near-constant high winds deform the trees on Spruce Knob, the highest point in West Virginia.

This mesmerizing and surreal landscape features intricate patterns of white and red sandstone.

The damming of the Colorado River buried an iconic geologic formation before record-breaking drought brought it back.

The largest natural travertine bridge in the world is nestled in a small canyon in central Arizona.

An unusual slot canyon in the Aztec/Navajo Sandstone has a cross-section like an inverted old-fashioned keyhole.