Colorful, cheeky signs spill out of legendary New Orleans folk artist Dr. Bob's Bywater studio warning you to "Be Nice—Or Leave."

A Cajun-style Christmas on the river also involves sky-high pyres and explosives.

The only place to see live frogs don pigtails and top hats, then eat their scrumptious legs.

A once-glowing grotto at the bottom of Waikapalae Wet Cave.

A Hawaiian stairway to heaven—that you can't climb.

Hiding in plane sight.

A unique set of caves that spits waves back out into the ocean.

This unusual lava tube spouts seawater during high surf.

This blowhole is supposedly caused by a trapped monster.

A cooled lava flow from the Haleakalā volcano formed these surreal-looking columnar basalt structures.

Get up close and personal with these majestic fish.

A true treehouse near Hawai'i Volcanoes National Park.

Submerged lava formations create incredible waterworks.

This legendary urban waterfall creates a dazzling display of rainbows.

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

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.

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

This black shoreline is made up of exploded lava particles.

This heritage rail line meanders through Delaware’s Red Clay Valley.

This historic hotel on Bathhouse Row in Hot Springs National Park has a storied history of gangsters and baseball greats.

A 30-mile-long glacially-carved canyon leads to a massive pair of glaciers.

In 1912, this idyllic Alaska landscape was blown apart in the largest volcanic eruption of the 20th century.

A sarcastic monument threatens to curse any "idiot" who dares remove it.