The biggest solar telescope in the world helps reveal the secrets of our sun.

A 12-foot sculpture serves as a constant reminder of the importance of protecting and restoring the Boardman River.   

Bronze footprints mark the path where a civil rights leader tried to march in peaceful protest before being knocked unconscious.

A subterranean world of tunnels links several buildings of this rare 19th-century asylum.

A lonely stone-sided terminal stands next to a grass airstrip on Michigan's Leelanau Peninsula.

After a short-lived attempt to bring America in line with the rest of the world, this road was left in metric.

See massive fossils that are over 200 million years old in northeastern Arizona.

A reproduction of earth's many biomes.

America's only nuclear missile silo open to the public.

A town honors its legacy of traditional American Indian pipe carving with one gigantic pipe.

Andy Griffith's hometown has made itself up to look like the fictional town of Mayberry.

This two-room shotgun shack in Tupelo is the birthplace of a King.

This iron and wood Civil War city-ship was the first vessel to be sunk by an electrically detonated torpedo.

Try not to get slimed in Tribeca.

Giant six-pack could provide one person a six-pack a day for 3,351 years.

A large circus museum with summer performances.

A fitting attraction for the corn capital of the world.

This prehistoric sinkhole lured exclusively male mammoths to their death, much to the delight of science.

The granddaddy of all tourist traps, built on ice water, jackalopes, and a giant dinosaur.

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

The world's longest known cave system.

A Roman-style column in Oregon hides a spiral staircase inside.

Despite a legend that says this highest peak in Oregon was climbed in high heels scores of people have died on its slopes.

A massive sea stack famous for its appearance in The Goonies.