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

A replica of one of the more than 15,000 civilian lookout towers that lined the U.S. coast during World War II.

Mariners once used this prehistoric landfill as a navigational landmark.

Florida's oldest bar was once a morgue, complete with a hanging tree and gravestones.

The birthplace of American international flight service has been turned into a celebrity's microbrewery.

The walls of America's oldest masonry fort famously "swallowed" cannonballs.

This abandoned NASA launch site is now a memorial to a trio of astronauts who were killed there.

After the attack on Pearl Harbor, rocks and fossils from every U.S. state were collected into a pyramid of national unity.

Where serial killer Aileen Wuornos drank her last beer.

A luxurious 1880s hotel with its fair share of Tiffany stained glass, Edison electricity, and of course, ghosts.

The ruins of this antebellum sugar plantation are the end result of a Seminole attack during the Florida Wars of 1836.

The former home of the Nobel Prize-winning American writer is now home to dozens of six-toed cats.

Known as the "Kissing Bridge" for its privacy, it also happens to be the last covered bridge in Ontario.

A massive, fading granite poem is all that remains of one Whitman superfan's tribute to the famous writer.

The giant birds honor two native North American species.

The purported world's shortest international bridge connects a homeowner in Canada to his backyard in New York.

This mill on Lake Erie appears to shrink as a viewer approaches thanks to an optical illusion.

This urban oasis is a marvelous meld of music and landscape architecture.

Small teepee-like houses built for TB patients have become sheds, studios, and bus stops around Colorado Springs.

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

A focal point of in Denver’s skyline for over a century, inspired by a Venetian basilica.

This sidewalk tribute honors Colorado's great culinary creation.

This was once the home of Gahan's Saloon, Denver's most storied speakeasy.

One of the oldest continuously-operated gay bars in the United States is allegedly haunted by Truman Capote and Tennessee Williams.