The first declared National Monument in the United States.

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.

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

The grave of America's 11th president is not in some grand monument but instead it's hidden away on the grounds of the Tennessee Capital.

The only swimming pool listed on the National Register of Historic Places is emptied and refilled each day with naturally filtered water.

A maritime museum holding the remains of Blackbeard's pirate ship.

A museum dedicated to the alleged Roswell Incident.

The last physical evidence of the Lewis and Clark trail is one of their autographs etched into this giant rock.

An apocalyptic seismic event creates a deadly chain reaction that ends with a 6-mile long lake developing within weeks.

All you ever needed or wanted to know about America's favorite whiskey, but not a drop to drink.

Equal parts record-breaking temple to consumerism and bizarre fun park, it's more than you think it is...

Thanks to a loophole in property ownership, this alleyway has become a cacophonous street gallery.

This daunting 1st century fortress was purportedly the site of one of the most dramatic revolts of the Jewish-Roman wars.

The taxidermied remains of a once-great parrot.

Giant, friendly pelicans in Central London, the most unlikely of places.

Hear the quietest sound from across the dome.

A 300-year-old tea shop that brought tea to the English people, not to mention the Queen herself.

Kings Cross Station pays tribute to its role in Britain's best-selling book series.

Richard III supposedly disposed of his nephews' bodies here in an effort to seal his claim to the throne.

This replica of the Greek structure is in the heart of Nashville.

This castle-like building in Manhattan helped destigmatize cancer in the 19th century.

The "Seinfeld" diner.

The most confusing clock in New York.