Catch a ride through the Pennsylvania countryside on this historic narrow-gauge railroad.

Inside this old mill is a collection of images that will always remain frozen in time.

Edoras, capital city of Rohan in Lord of the Rings, once sat atop this isolated New Zealand mountain.

Take a stroll through this centuries-old tunnel of enormous moss-hung evergreens, nestled among the grounds of America’s first public sculpture garden.

The notorious Wild West outlaw was raised in this unassuming abode.

Once the "Eighth Wonder of the World," this iron railroad bridge was decimated by a tornado.

Major tourist destination known for its bubbling mud-pools and hot thermal springs.

Dolphins, ancient clams and hundreds of waterfalls make this one of the world's top tourist destinations.

Tubing through a cave lit with glowworms is a magical underground experience.

When ecosystems collide in the arid Southwest.

This spectacular track has run continuously since 1882.

This shifting North Carolina sand dune is an odd little desert surrounded by oceanic forest life.

This tiny square mile of Canadian sand was once considered the world's smallest desert.

This 5-by-6-foot wooden hut is the smallest historic post office in the U.S.

Giant, natural amphitheaters made of delicate geological formations called "hoodoos."

This rugged area of red rocks and arches is often considered one of the most beautiful places on Earth.

This quiet park's strange sedimentary spires were named after Kodak's color film.

This narrow canyon has been carved by the river over thousands of years into spectacular and curious forms.

Even Henry David Thoreau found this glacial pothole irresistible.

A very big rock just plopped down in the New England woods.

Once in a state of dilapidation, this candy-inspired fortress is now being revived.

Eccentric concrete mansion and museum designed and built by hand from the inside out.

Inspiring Herman Melville and Henry David Thoreau, Mount Greylock in western Massachusetts is the highest point in the state at 3,491 feet above sea level.

The railroad tunnel nicknamed the "Bloody Pit" for taking the lives of hundreds during its construction.