A beach made of semi-precious green sand on the Big Island of Hawai'i.

These picturesque Hawaiian falls are home to a rare species of fish that uses a special sucker to climb up cliffs.

Earth's tallest volcano is sacred to Native Hawaiians, and home to a dozen world-class observatories.

A tunnel of hardened lava along Maui’s famous Road to Hana.

This black shoreline is made up of exploded lava particles.

A beautiful waterway tucked in the corner of a power plant.

The underground hideout of a Japanese soldier for whom World War II ended in 1972.

An abandoned bait shop with a front lot filled with storage boxes.

A mysterious monument meant to be a guide into "an Age of Reason" was destroyed after an apparent bombing.

Crumbling ruins mark the site of a couple's grisly murder in the woods.

The beauty of urban decay, hiding some dark secrets.

While The Dick Lane Velodrome is Atlanta’s official home of track cycling and Georgia's only velodrome, many are unfamiliar with this community gem.

An abandoned putt putt golf course nestled hidden next to one of the local water towers and a local veterinarian.

The first integrated firehouse in Atlanta houses a museum on the history of desegregation in the city's fire department.

A modest walled graveyard where nobody is actually buried.

The ruins of an open-air theater built on this Georgia island in the 1970s.

Nature (and graffiti) reclaim this old waterworks that has been surrounded by a bike path and network of walking trails.

A historic canal winds through a unique, swampy landscape.

An abandoned munitions storage facility with a rich architectural history.

The ruins of a resort and casino sit on the banks of this blue hole spring that pumps 70,000 gallons of warm, clear water every minute.

Georgia's first brewery is also one of its oldest surviving buildings.

This collection of ferns from across the globe is the largest assortment in the United States.

One of corporate America's best-kept secrets is also one of the most publicly displayed.

Developers built a Walmart around one family's plot and constructed a mausoleum in the parking lot.