Built following the War of 1812, this fort has withstood hurricanes for centuries.

The remnants of the fortress that saved Georgia from the Spanish still stand guard on their swampy island.

This twisty sign depicts the chain's first logo.

A museum dedicated to the alleged Roswell Incident.

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

One of the few places where you can visit a cenote and Maya ruins at the same time.

The United States’s oldest funicular railway glides up and down a steep Pittsburgh street.

Once decrepit and slated for demolition, now one of the longest pedestrian bridges in the world.

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

Those with a sharp eye can find the hidden image of a German Shepherd on the memorial's Mural Wall.

Lady Liberty's first beacon of enlightenment is now displayed in a museum near the statue.

The original toys that inspired the beloved children's stories are on display at the New York Public Library.

Whisper secrets in a busy station only to be heard on the other side of this acoustic arch.

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

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

More than five miles of underground passageways.

The mysterious wonder of an underground waterfall is illuminated by multicolored lights.

One of corporate America's best-kept secrets is also one of the most publicly displayed.

The world's largest collection of ticks.

This abstract roadside poultry was saved from demolition by outraged drivers and pilots.

These ancient ritual mounds are our best window into the culture of the ancient Mississippians.

A bizarre roadside attraction and the first instance of miniature golf in the world.

The first declared National Monument in the United States.

A mural of the Virgin of Guadalupe painted on the rock wall by canyon's religious namesake.