When zealous marijuana enthusiasts kept stealing the "Mile 420" highway marker, the State of Colorado got creative.

These mystical miniature houses bring a touch of magic to the New Jersey woods.

The rocks of a certain area of Butte, Montana give off a musical ring when hit.

This haunted hotel built on natural springs once served as a hospital for a quack doctor promising a cure for cancer.

A 200-year-old bar with a cheeky name claims to have served Edgar Allan Poe his final drink.

A sliver of nostalgia in Seattle's Viretta Park.

The future of roadside attractions is this sci-fi soda mecca that is home to a 66-foot tall neon pop bottle.

Given just one more year to live, Conrad Schuck built his dream house in Bartow, Florida.

Beloved bar home to musicians of all eras and reputations.

This stunning sea creature-shaped home blends into the landscape like a fantasy villa.

Nature's biggest mammal swims in landlocked Oklahoma.

A medieval castle in the middle of rural Texas.

The remnants of a wooden-hulled fleet built and abandoned in WWI, now home to a thriving ecosystem.

Berthed at the Charlestown Navy Yard in Boston, "Old Ironsides" is the oldest commissioned warship still afloat.

The only way to see Pittsburgh is from the top of this lookout point, just like the ancient members of the native peoples did.

Home to Hollywood history and a very special salt crystal.

A humid oasis combines recreation with exploration in a unique underwater cavern.

Gleaming self-built castle towers made from beer cans and inspired by "Vitamin Mary Jane."

Faces carved into the cliffs create an otherworldly walking trail.

A warning to the weak-kneed: This narrow bridge does its swinging eight stories high.

A hidden alley in urban Baltimore is a haven for graffiti artists.

New fungal and bacterial species call this deadly lake home.

At Chicago's revered Field Museum, visitors are invited to learn about and literally explore DNA.

True to its name, this bouncy walkway may be the world’s smallest suspension bridge.