Explore the largest pure gypsum deposit in the world, and go dune sledding while you're at it.

The second-largest cave chamber in the world was discovered in 1898 by a 16-year-old and a friend known as "Pothead."

The location where the iconic movie character declared it was time to go home.

This balancing rock is one of Utah's most unusual geological formations.

Most-visited and most-photographed slot canyon in the American Southwest.

Dramatic river bend surrounds a natural red-rocked pedestal.

This unique art installation used boiler tubes from a decommissioned power plant to resemble Antelope Canyon.

The colonial city's social history is reflected in its fanciful door knockers.

A cozy bookstore and coffee shop in the heart of Cartagena's Old City.

These ancient sacred grounds granted amnesty to those who managed to reach them.

This black shoreline is made up of exploded lava particles.

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

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

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

Ten acres of the Kula Forest Reserve make up this wondrous state park.

Images chiseled into the basalt here date back an estimated 300 years.

You'll find just about anything in this funky Tbilisi flea market.

This iconic Parisian bookstore doubles as the "Tumbleweed Hotel" for traveling writers.

This beachside town is home to a diverse nature reserve, multiple cays, and one of the three bioluminescent bays in Puerto Rico.

The unique collection often goes unnoticed by visitors focused only on the archaeological objects.

This strange seaside tower got its name from a wealthy eccentric who would hide coins among its stones.

A sign at the end of the Santa Monica Pier marks the traditional end of the legendary American highway.

A second generation sun-powered marvel lights up the night.

This rusted car found in Petrified Forest National Park's Route 66 exhibit may be the most photographed abandoned car in the country.