A 13,000-year-old mastodon skeleton was found during the construction of a 19th-century New York mill.

Look closely and you’ll notice that the color changes a third of the way up the tower.

Members of Congress have traveled between the buildings on Capitol Hill for a century hidden from tourists, press, and storm clouds.

Perhaps the most scandalous statue of America's first president.

A museum cafe showcases Native American dishes and indigenous ingredients from across the Western Hemisphere.

A tunnel of hardened lava along Maui’s famous Road to Hana.

Paranormal experiences in this hotel's room 217 led Stephen King to write "The Shining."

Officially named the "Loneliest Road in America," this barren stretch of Nevada road offers almost nothing but sky and open fields.

The longest living non-clonal organisms on Earth.

These huge stone ovens in the desert fueled the Nevada silver boom, and may have also been a hideout for outlaws.

This former mining railroad is one of the best-preserved short lines in North America.

Strange red rock formations that have been attributed to a higher power for hundreds of years.

The highest bridge in America was built for an almost unnervingly small amount of money.

The romance of early commercial flight still fills this Art Deco destination.

The Denver airport is guarded by a 32-foot-tall sculpture of a demonic horse.

A dangerous narrow-gauge railroad once traced a route through this striking canyon.

Frank Lloyd Wright's most iconic home dangles over a Pennsylvania waterfall.

This 4,000-foot-diameter hole is touted as "the most well known, best preserved meteorite crater on Earth."

The world's longest known cave system.

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

A beautiful geyser under environmental threat.

A breathtaking array of ancient Pueblo structures and artifacts counterintuitively preserved by neglect.

The first declared National Monument in the United States.

Home to items never before seen by the public.