Impossibly life-like natural history models created out of glass by a father and son.

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

The deepest lake in the United States, and once the site of epic destruction that lives on in legends.

Two rocks in a perpetual kiss and one of "the most romantic spot in America."

A volcanic fissure over two miles long and up to 70 feet deep.

Mountain known by the Tillamook Tribe as "the place of the supreme deity."

A roaring, awe-inspiring double cascade of icy water flows through woodland Oregon like something out of a Tolkien novel.

One of the world's oldest and most massive living organisms is a grove of quaking aspens.

An unoccupied lighthouse encased in layers of ice from the waters of Lake Erie.

Shoreline strewn with the remains of ghostly fallen trees.

Stroll through a wonderland of stupendous moss-covered trees.

Turnip-shaped island just off the Michigan shore in Lake Huron.

Canyon walls shrouded in ferns.

Most-visited and most-photographed slot canyon in the American Southwest.

Where monkeys run wild and the humans are caged.

A unique sculpture park that specializes in the huge and bizarre.

Enormous lake at the bottom of a unique cave system.

A massive sea stack famous for its appearance in The Goonies.

The rocks in this arid basin leave trails of movement behind them.

A humid oasis combines recreation with exploration in a unique underwater cavern.

An artificial crater field that trained astronauts for lunar exploration.

From the sky, a kaleidoscope of color brightens the grey landscape of the San Francisco Bay.

A massive volcanic plug is now a protected area that hosts a number of bird species.

Strange red rock formations that have been attributed to a higher power for hundreds of years.