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.

The Empire Mine is "one of the oldest, largest, deepest, longest and richest gold mines in California."

Bits and pieces from the ill-fated Donner Party's winter cabins.

A crumbling Beaux Arts monument to the Bay Area's age of rail.

Concrete strongholds stand guard over the Golden Gate.

The haunting ruins of Jack London's dream house.

Nursery with extensive collection of flesh-eating plants operated by the author of "The Savage Garden."

'Cause the fence start shaking, the earth was quaking.

This extravagant Art Nouveau rest stop features a million-dollar view of the Columbia River.

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

This sandstone mansion was the home of two of Oregon's most important pioneers.

A beautiful 62-acre Catholic shrine and botanical garden.

This concrete ship has had four careers - World War I tanker, floating amusement park, fishing pier, and artificial reef.

Housed in a memorial lighthouse, this museum relays the history of surfing, beginning with the antics of royal Hawaiian teenagers.

The first Russian Orthodox church in North America and an Alaskan landmark.

One of two side-by-side totem pole parks dedicated to educating visitors on Tlingit history and culture.

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

This Taoist temple is the oldest continuously used Chinese temple in California.

Commonly referred to as the most photographed Victorian home in the United States.

Humboldt's human-powered sculptures race across land and sea for days on end in a wacky quest for dominance.

A trash dump made beautiful by nature's power.

No one is sure if the world's fourth-largest diamond had been found in a rubbish heap or was pawned by Napoleon's mom.