These picturesque Hawaiian falls are home to a rare species of fish that uses a special sucker to climb up cliffs.

More than 2,000 species of tropical plants call this nature preserve and sanctuary home.

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

Under a glass sidewalk lie the remains of some of Manhattan's oldest buildings.

One day a year it is legal to jump off of this astoundingly tall bridge that spans an Appalachian gorge.

You can climb to the summit of Black Mountain, as long as you sign the waiver.

A theme park featuring a replica of Noah's Ark built to the measurements specified in the Bible.

This modern castle sat empty for decades before a fire inspired its builders to complete its luxury halls.

Moonbows over Kentucky.

The world's longest known cave system.

Knoxville’s architectural icon was the symbol of the 1982 World’s Fair, even catching the googly eye of Bart Simpson.

This large cave is a summer home to thousands of bats and has a rich history dating back to prehistoric times.

All you ever needed or wanted to know about America's favorite whiskey, but not a drop to drink.

Labor provided by Great Depression-era programs restored these 25,000 acres in Tennessee.

Beer lover's can-covered house.

A rare chance to get up close and personal with a 13-mile ribbon of ice near downtown Juneau.

Breathtakingly blue walls shimmer inside the "Glacier Behind the Town."

This historic Victorian hotel has a scandalous history of affairs and murder.

This castle was once considered as an option for the Royal Family's alternate residence, but you may know it better from the 'X-Men' movie.

A stockpile of childhood lunch pails turned collectibles.

These ancient ritual mounds are our best window into the culture of the ancient Mississippians.

A man's home is his castle.

This intricate Hindu temple is the largest of its kind outside of India itself and was constructed like a giant puzzle.

The largest cemetery in the American Southeast is a hidden gem near the heart of Atlanta.