The old fire tower is one of the last of its kind in the United States.

For thousands of years, Native American hunters drove buffalo straight off this cliff in Montana's Yellowstone Country.

A pop-culture attraction outside of Dyersville, Iowa, hits a home run.

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

These giant metal horses graze on a hilltop near the Montana highway.

A striking sculpture built to honor the women of the Lakota and Dakota Nations.

This metallic stampede sits frozen on a Washington ridge yet the artist's vision is still incomplete.

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

An antique Beechcraft airplane serves as a giant windsock for people driving through the blustery open country of eastern Wyoming.

One of Cincinnati's greatest fighters once trained at a now defunct gym in this Over-The-Rhine neighborhood.

You can walk through the first Boeing Air Force One, which famously carried JFK's casket from Dallas back to D.C.

This humble star-gazing center touts itself as the "Birthplace of American Astronomy."

The oldest operating Mississippi River–style steamboat still navigates the Ohio River.

The last living thing to come out of the rubble after 9/11 is now a symbol of hope and resilience.

Where now stands a 42-story condominium tower of marble, glass and steel was once the central market of New York’s slave trade.

Built hundreds of years ago this downtown iron barrier once protected a much despised king.

A whimsical, but often overlooked clock in Park Avenue.

This historic address is home to the beloved ball and is an almost totally empty building among the most expensive real estate in the world.

Possible relics of the ancient Roman city are hidden in this restaurant's façade.

This vacant church in the Financial District was once the heart of New York's first Syrian immigrant community.

This cemetery has graves dating back to the 17th century, including the city's oldest carved tombstone and an ominous cryptogram.

Hear the tales of New York's most notorious criminals.

The New York hotel where tragic visionary Nikola Tesla spent his final hours, destitute and alone but for the pigeons.

A historic 1890s architectural masterpiece with an iconic clock tower that, once open to the public, now faces an uncertain future.