The park preserves a single, rare species of carnivorous plant that spells doom for unsuspecting insects.

Only known mainland rookery of the threatened Stellar sea lion.

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

The highest point in Washington state is a volcano covered in glaciers.

An abandoned network of military bunkers and tunnels open for anyone willing to descend into the darkness.

A walk through the historic city center, under the streets of Seattle.

Canyon walls shrouded in ferns.

Built by the inventor of the radio, this abandoned hotel has housed early radio employees, military men, and a dangerous cult.

An enchanting tunnel of cypress trees leads to an old morse code station still used today.

The lighthouse central to the 1980s horror classic "The Fog" is, in fact, located in one of the foggiest areas of the Pacific Coast.

The last remaining relic of San Francisco's glittering 1915 Panama Pacific Exposition.

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

One of the largest Native American shell middens stands 30 feet tall.

Mariners once used this prehistoric landfill as a navigational landmark.

The walls of America's oldest masonry fort famously "swallowed" cannonballs.

This abandoned NASA launch site is now a memorial to a trio of astronauts who were killed there.

Former villa and estate of James Deering developed to preserve native tropical forests.

An 18th-century Spanish watchtower made entirely of seashell and concrete.

A tribute to Ponce de Leon's supposed quest for eternal youth.

This architectural onion has an original 1930's Jerry O'Mahony dining car at its core.

The first bridge observation tower in the U.S. offers one of the best views of Maine.

This candy-striped tower is the farthest east you can go in the United States.

This 19th century granite fortification is one of the most well preserved forts in New England.

This tiny patch of arid sand sits in one of the greenest states in the United States.