A raised boardwalk winds through a thicket of stunted, century-old trees no more than nine feet tall.

A grove of "candelabra redwoods" deep in California's Lost Coast.

Train debris from the deadliest avalanche in United States history can still be found in the ravine where so many perished.

The longest and widest floating bridge in the world.

This historic tower in the California desert promises visitors a "vortex of good vibes".

The southernmost outpost of the Russian Empire in colonial America.

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

This long, dark tunnel is open to hikers, but those without lights are known to get confused even on the straight path.

Hollowed out cedar log tubs set in an ancient towering forest.

This lake in the Cascades lives up to its name, disappearing down a hole every spring.

The trunks of 3,000 year-old trees lurk beneath the surface of this crystal clear lake in Oregon.

Unknown to many, this sparkling turquoise lake hides amid Oregon's snowcapped mountains.

This charmingly homemade amusement park has been growing for 40 years.

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

This head-spinningly bizarre Depression-era art cave is wall-to-wall quartz and Jesus.

This park is home to well over 100 handmade birdhouses.

This beautiful ridge-top trail is dotted by tiny homes apparently built by a group of itinerant fairies.

This dark, quiet forest on the outskirts of San Diego is dense with rumor and lore.

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

Despite being stolen multiple times, this civic electrician's street corner Snoopy won't be stopped.

This secluded walking trail is a hidden gem of a Pittsburgh park.

A waterfall 600 ft. inside a mountain, once the bane of gold miners, is now a spectacle of nature.

This abandoned prison castle has become an imposing gallery of graffiti art.

The hike through a narrow river flanked by the 2,000-foot-tall walls of Zion Canyon is one of the best in the world.