A small peaceful park and waterfall tucked amid the urban grind of Midtown Manhattan.

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

An architect's childhood fantasy treehouse made real.

A beautiful geyser under environmental threat.

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

This Yellowstone geyser may not shoot as high as the nearby Old Faithful, but it erupts for considerably longer.

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

Founded as a refugee camp, now a popular tourist spot.

At this faithfully preserved medina off the Moroccan tourist circuit you can walk through six centuries of history in one day.

A museum dedicated to the centuries-old cave dwellings that housed marginalized communities on the outskirts of the former capital of Muslim Spain.

Mysterious texts covered in mystical symbols were found in caves at this site centuries ago.

Spanish architects used seized Muslim gravestones to rebuild parts of the fortress.

A centuries-old house, once part of the wall of Granada, sports musket barrels from the battlements which allude to its original owner.

As Ernest Hemingway scribbled notes for stories, he left a lasting impression on this bar: a charred hole where he extinguished his cigars.

A popular place to pick up prehistoric coral fossils from the time when Michigan was an ocean.

This shallow cave got its name from copious amount of human bones found inside.

Island where motor vehicles are banned -- home to the only carless highway in the United States.

A hot dog stand where the heads are just as hot as the dogs.

The palatial McDonald's that inspired Wesley Willis.

Four glass boxes hover over 1,000 feet in the air to give visitors an unparalleled view of Chicago.

This whimsical Oz-themed park had a wonderful impact on the surrounding neighborhood.

In 2004, a Dave Matthews Band tour bus dumped 800 pounds of waste off a bridge and onto an unsuspecting tour boat below.

The rodent-shaped sidewalk imprint that earned worldwide media attention.

The beloved home to all publications indie, erotic, and punky.