A series of waterfalls and pools that flow through the 'Ohe'o Gulch and into the ocean.

Inside, visitors are treated to the rich history of sugar farming and its impact on Hawaiian society.

Take shelter from Hawai'i's tropical heat under the massive canopy of largest Banyan tree on the island.

This former luxury resort in Kaua'i is now an abandoned relic.

Aqueducts have dramatically changed this old lake, now home to tufa towers and its very own species of tiny brine shrimp.

The drama of nature in full effect in this Nevada State Park.

The intricate stonework of Machu Picchu serves as a testament to Incan engineers.

The ghostly remains of an accidental sea.

On the outskirts of a reborn ghost town, a decaying post office remembers the bad old days.

The oldest hotel in the world has been operated by the same family for over 1,300 years, even catering to samurai.

This historic tower in the California desert promises visitors a "vortex of good vibes".

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

A sixth-century Byzantine cistern hidden below a modern carpet store.

The world's largest mountain carving could fit all of Mount Rushmore inside it many times over.

Hidden behind Lincoln's head is a chamber containing enamel plates documenting American history, sealed in a teakwood box in a titanium vault.

Since it formed millions of years ago, this cave system has been a sacred burial ground, a Prohibition-era speakeasy, and the center of an amusement park.

The gorgeous entrances into the city's underbelly look more like grand halls than subway stops.

The glowing blue Nymphaeum of Emperor Tiberius.

Medicinal spa created from the mineral-rich runoff of a geothermal power plant

A fitting attraction for the corn capital of the world.

See massive fossils that are over 200 million years old in northeastern Arizona.

A series of waterfalls so massive they straddle the border of Argentina and Brazil.

The world's largest mineral hot springs is home to a herd of bison, a free public bath house, beautiful mineral formations, and a terrifying swinging bridge.

This archaeological dig site and museum is home to one of the largest dinosaur fossil collections in the world.