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

The unbelievably opulent home built for an infamous newspaperman.

These tourist trap caverns are said to be the former home of a legendary Pennsylvania Hermit.

Even Henry David Thoreau found this glacial pothole irresistible.

A replica that won't float away.

This concert pavilion on the shore of the Great Salt Lake has been destroyed by fire, water, and disinterest but keeps coming back.

A hard-to-reach oasis in a desolate corner of Death Valley National Park.

Nondescript elevator doors open to reveal a stunning, surreal world.

One man has installed bathtubs into the Utah desert floor to harness the powers of a natural hot spring.

This concrete tangle of square pipes has stood as a proud thorn in the city's side since the '70s.

Labor provided by Great Depression-era programs restored these 25,000 acres in Tennessee.

A technicolor place of worship for Elevationists.

San Francisco's oldest surviving monument and meeting place for 1906 survivors.

A stunning, abandoned limestone quarry in southern Indiana provided the stone to erect the Empire State Building.

Once an ambitious nature spa, these forest ruins now provide a serene monument to failure.

An extraordinarily ornate museum in San Diego holds wondrous anthropological treasures.

The mysterious wonder of an underground waterfall is illuminated by multicolored lights.

Who needs fancy modern water slides when this giant North Carolina rock works just as well?

This grand mansion has starred in everything from Bones to Buffy.

This natural wonder drops 16 stories straight down through rare flora and streaming waterfalls.

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

Sail through this subterranean show cave that is home to a legend that would go on to name nearly everything around it.

Visit this playground of waterfalls, caves and sinkholes.

One of the oldest living oak trees in the Southeast.