This narrow coastline trail through the dense Kauai wilderness is among the most beautiful and dangerous in the world.

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

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.

Formerly secret, precariously perched boulders.

A huge musical instrument played by the ocean.

One of nature's most well-scheduled phenomenons resides in Wyoming's Yellowstone National Park.

The largest hot spring in the United States is, as the name suggests, a stunning show of natural color.

This metal tower in the desert provides views of a handful of Nazca geoglyphs.

If you’ve ever seen a picture of Machu Picchu, then you’ve seen a picture of Huayna Picchu—you just didn’t realize it.

A set of ancient drawings in the desert of Peru that are so massive, many of them can only be fully seen from the sky.

A remote candy-striped mountain in the Peruvian Andes straight out of the pages of Dr. Seuss.

Erotic art covers the walls of the largest ancient pleasure palace.

The last moments of the ill-fated Pompeiians, frozen forever in plaster.

Five candy-colored villages on the Italian Riviera.

A temple to modernity, tucked away amid Barcelona's more well known museums.

Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.

The ruins of the bathhouse used by the ill-fated last Aztec emperor still lie in Chapultepec Park.

Located near the U.S.-Mexico border, this park remembers the famous raid of General Francisco “Pancho” Villa and his soldiers.

Some of the Old West's most notorious outlaws frequented this mining town.

This volcano rises like a giant anthill from the plains below, with a road spiraling up to the rim.

One of the American Southwest's most extensive collections of Navajo rock art.