A daily replay of the experiment that proved the rotation of the Earth.

The sounds of the world's largest fully functioning pipe organ dazzle shoppers at a Philadelphia Macy's.

Current docking place of the SS United States, the fastest transatlantic ocean liner.

This elaborate towering structure was once famed for its revolutionary height.

Ant sculptures march up the side of what used to be an iconic spot in punk rock lore.

Yo, Adrian!

The first American department store, and home to the largest operating musical instrument in the world.

This charming colonial alleyway is one of the oldest continuously used residential streets in the U.S.

The origin of this mechanical boy was a mystery until he revealed his maker by writing it in perfect cursive.

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

This charmingly homemade amusement park has been growing for 40 years.

Featuring a casually threatening atmosphere along with dessert and coffee to die for.

Oregon's unexpected high desert, displaying layers of time in a colorful show.

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

The longest continuous lava tube in the continental U.S. offers 2.5 miles of dark explorations for the adventurous.

A beautiful geyser under environmental threat.

Home to items never before seen by the public.

Mysterious rocks that ring musically when struck.

The deepest lake in the United States, and once the site of epic destruction that lives on in legends.

The first declared National Monument in the United States.

A 200-year-old bar in the historic French Quarter refuses to give up its place in history, nor its role in securing ours.

A layered tribute to the work of mosaicist Isaiah Zagar.

A roaring, awe-inspiring double cascade of icy water flows through woodland Oregon like something out of a Tolkien novel.

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.