The world's largest mountain carving could fit all of Mount Rushmore inside it many times over.

One of nature's most well-scheduled phenomenons resides in Wyoming's Yellowstone National Park.

The magic's in the hole!

The largest hot spring in the United States is, as the name suggests, a stunning show of natural color.

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

The hike through a narrow river flanked by the 2,000-foot-tall walls of Zion Canyon is one of the best in the world.

A beautiful geyser under environmental threat.

A trash dump made beautiful by nature's power.

A 200-year-old bar in the historic French Quarter refuses to give up its place in history, nor its role in securing ours.

Situated on a sacred Inca site, this 16th-century cathedral took nearly 100 years to build.

The intricate stonework of Machu Picchu serves as a testament to Incan engineers.

A surviving remnant of the thick ice mass that once mantled most of Western Canada's mountains.

This small museum gives visitors a chance to soak up the history of the "sponge capital of the world."

One of the world’s largest and deepest freshwater springs, where mastodons once roamed.

The largest retailer of seashells in the world.

One-time winter retreats of prolific inventor Thomas Edison and his friend Henry Ford.

Welcome to old Florida, where a 1940s mermaid show is still enchanting visitors.

The only road through the heart of Glacier National Park.

This angular Dwarven tunnel cuts through a mountainside in Glacier National Park.

One of the largest aviation events in the world brings half a million aircraft enthusiasts to Wisconsin each year.

A bypass decorated with large wooden troll carvings.

Software company Epic Systems has created one of the strangest and largest workplaces of all time.

A unique botanical garden housed in three giant geodesic domes.

Home to the world's largest refracting telescope and the birthplace of modern astrophysics.