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

Watch the newest land on the planet form before your eyes.

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

Hide from the tourist hordes in these relatively unknown, and unguarded lava caves.

This legendary urban waterfall creates a dazzling display of rainbows.

Located within a historic park, the beacon is the oldest standing structure in Miami.

An abandoned water sports stadium that has become a haven for graffiti and decay.

Former villa and estate of James Deering developed to preserve native tropical forests.

The only swimming pool listed on the National Register of Historic Places is emptied and refilled each day with naturally filtered water.

A mysterious pillar in an ancient burial chamber is said to predict how long you have to live.

The stoutest tree in the world.

This beautifully deceptive waterfall is something far different from what it appears to be.

A hidden gem, named after a San Franciscan icon, offers spectacular views of the Pacific Ocean.

The graffiti-covered remnants of a former triangulation station are balanced precariously on this California peak.

Hidden deep in the Guatemalan jungle is a turquoise paradise of natural pools, caves, and waterfalls.

Experiencing Guatemala's sensory-exploding church is a blunt reminder of European influence.

Volcanically heated hot springs.

Guatemalan womanizer, venerated during Holy Week.

Central America's deepest lake is actually a volcanic caldera, surrounded by three volcanoes.

A collection of heirloom roses tucked in a spectacularly beautiful botanical garden on Lake Atitlan.

A library built during San Francisco's pioneer times is a student's retreat, bibliophile's sanctuary, and chess player's delight.

A garden oasis filled with flowers mentioned in the works of William Shakespeare.

Not merely a museum – but a whirring powerhouse that offers a subterranean peek into the heart and soul of cable car operations.

A collection of 20th-century automata, penny arcade games, and musical contraptions.