The final resting place of the songwriter who penned “Take Me Out To The Ball Game."

The abandoned zoo enclosures offer a perfect place to experience the other side of the bars.

The United States Capitol's former columns still stand.

The 320-year-old tree that greeted General Lafayette and rerouted an interstate highway.

A monument marks the location of the first successful steamboat demonstration.

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

A beautiful geyser under environmental threat.

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

The only natural lake in the world that drains into both the Atlantic and Pacific Oceans.

Meet your friends, marry your true love, or tell your enemies to kiss your butt under this historic Pittsburgh timepiece.

While not recognized by Guinness, this chocolate waterfall is likely to be the world's largest.

An acoustic anomaly with a mysterious cause.

Less a museum than a bizarre fantasy world created by artists and engineers.

The "World's Largest Underground Business Complex," a 55,000,000-square-foot city underneath Missouri.

Half of a waterfall goes into the river while the other half seems to disappear.

A place to eat for on-the-run agents and espionage enthusiasts.

A pre-Industrial Age iron furnace and the site of a nearly-forgotten piece of Black history.