The site where Poe "in great distress, and ... in need of immediate assistance" likely died.

An organ located deep within a cave, whose "pipes" are the geological features of the cave itself.

The best Tiki bar in Las Vegas.

Abandoned power station once home to a squatter community, now being developed into an arts center.

The beautiful tunnel that ran from the lobby to Penn Station is still hidden underneath 34th Street.

Her final resting place was intended to be modest and private, but the power of her popularity continues to draw visitors.

Julia Morgan's Moorish-Gothic labyrinth of fountains, trees, natural light and Oakland's notable dead.

Unique antiquarian shop specializing in globes, maps, and prints.

The loneliest island in New York.

Shop of curiosities with a dinosaur museum tucked in its basement.

The second largest waterfall by volume in the U.S., Willamette Falls is outdone only by Niagara in the amount of water that is pushed northward.

The Magical World of George Phar Legler.

This road in the Great Smoky Mountains was supposed to assuage a displaced community, but ended up a $52 million dead end.

The man who first patented the Ouija board rests in peace beneath a headstone that playfully reflects that achievement.

Half of a waterfall goes into the river while the other half seems to disappear.

The artist James Turrell is repurposing an extinct volcano crater as an observatory to experience the cosmos.

A secretive collection featuring objects that were designed specifically for U.S. intelligence operations.

A multi-storied adobe complex has been inhabited for more than a thousand years.

A collection of full-size movie monsters opened to the public.

A short hike into the mountainside forest reveals a decaying 1890s town.

The randomness of this wall of lava lamps helps encrypt up to 10 percent of the internet.

This ultra-modern home clings to the slope of the Hollywood Hills on a precarious stilt.

By day this New Orleans square is for pedestrians, but by night it is a kingdom of kittens.

A half-mile long and three stories high, this bridge over the Des Moines River Valley mimics a descent into a mine shaft.