An Inca spa, military outpost or maybe… both?

A vast array of tropical plants collected by a vacationing couple.

A natural arch offers panoramic views of Yangshuo's karst hills.

An idyllic swimming pool tells the tale of Hemingway's trouble with women.

The beloved statue at the National Academy of Sciences is oh so inviting to sit on.

A tiny piece of the Moon is embedded in this stained glass masterpiece.

Labor provided by Great Depression-era programs restored these 25,000 acres in Tennessee.

Keshwa chaca, among the last handwoven Incan bridges, crosses Apurimac Canyon in Peru.

A remote candy-striped mountain in the Peruvian Andes straight out of the pages of Dr. Seuss.

A painting in the historic Cathedral Basilica depicts Jesus and his disciples dining on a traditional Peruvian menu.

The intricate stonework of Machu Picchu serves as a testament to Incan engineers.

The mortal remains of an estimated 70,000 people lie in the basement of a monastery in Lima, Peru.

The former home of the Nobel Prize-winning American writer is now home to dozens of six-toed cats.

The high point on the 16th president's eponymous roadway is marked by a massive version of his head.

The granddaddy of all tourist traps, built on ice water, jackalopes, and a giant dinosaur.

The world's largest mountain carving could fit all of Mount Rushmore inside it many times over.

A rare chance to get up close and personal with a 13-mile ribbon of ice near downtown Juneau.

The highest point in Tennessee, Clingmans Dome bears witness to the ravages of one type of insect.

Forget Hollywood, one of the biggest stars in the world can be found in Roanoke, Virginia.

Exact replica of the ancient monument, but much, much lighter.

The scuba diving training facility was named for the steam that rises from the cave's chimney.

The sci-fi villain is a little-known inhabitant of the U.S. capital's largest cathedral.

The ancient dwellings of the Puebloans, located in the cliffs of majestic mesas.

The first declared National Monument in the United States.