Rare signs of the former Soviet Union in the Caribbean, though not where you'd expect them.

This popular tourist cave was ignored for almost 200 years before being mined into an attraction.

This mountaintop lake bubbles and steams in a perpetual boil, thanks to its direct link to the Earth's interior.

Under the right circumstances, this waterfall in Yosemite briefly turns a luminescent fiery orange.

A bomb shelter and some fireplaces are all that remain of the house Fred Roberts tried so hard to keep standing.

The beautiful 1920 Pantages Theatre remains hidden just underneath the LA Downtown Jewelry Exchange.

This eerily well-preserved coal town was saved from destruction by a Sean Connery movie.

In this century-old literary safehouse, print is alive and well.

A ruined castle has more than its fair share of legends and ghost stories.

Life in this isolated, hilltop lighthouse was lonely, but it sure was lovely.

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

Barely visible foundations remain where Stow Lake’s “observatory” once welcomed visitors.

Ruins of a once-opulent grand Victorian resort.

Radioactivity still cause for concern at this urban explorer's paradise.

A trash dump made beautiful by nature's power.

A prohibition-style speakeasy takes up residence in the last Victorian residence in Hollywood.

The old Niles Canyon Aqueduct in the San Francisco Bay Area is a bemusing and secret trail through nature for wayward travelers.

A museum dedicated to a sea that should have never been.

Big gun installations, built over a massive cemetery, now abandoned & hidden in trees.

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

A strange house built only at night, with rumored mystic inspiration.

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

It should come as no surprise that the best view of the Hollywood sign is from Batman's lair.

The sea once considered an ecological wasteland is now called "crown jewel of avian biodiversity" by scientists.