A backdoor to Machu Picchu that only the most foolhardy infiltrator would attempt to breach.

Hidden in the Chihuahuan Desert resides an amazing collection of petroglyphs.

Get buzzed beholding one of the world's largest coffee-machine collections, then step into the café for a specially brewed cup.

Across Ring Mountain is a vast collection of Native American petroglyphs unique to the region.

This small but lovely sinkhole lake is the last remnant of a great prehistoric water basin.

In the early Roman Empire, people deemed traitors and criminals were tossed to their deaths from this rock.

This Chinese museum proves that it's a watermelon world, we're all just living in it.

This bakery and museum offers tours of the tastes and mythology of Aachen's signature spice biscuit—just don't ask for the recipe.

One of the world’s largest collections of petroglyphs records 2,000 years of human activity.

A familiar otherworldly creature guards this 12th-century Scottish abbey.

At the crypt of St. Mary of Eulogies and the Dead you are left alone to ponder mortality among piles of skulls.

A controversial blue hoop has been puzzling freeway drivers since 2013.

A "simple-hearted artist" turned an isolated Icelandic valley into his own art museum.

This tiny little island has, as the name says, just enough room for its single house.

A nature and cultural preserve named for its multitude of petroglyphs carved by the Northern Sinagua people.

An unassuming secret door once led to a legendary watering hole.

This unique crypt designed by Frank Lloyd Wright for his longtime friend was not completed in either man's lifetime.

The walls of the iconic dome are hollow and have a secret stairway.

This 17th-century mausoleum is topped with an acoustic marvel.

A California city claims to be the home of a fast-food classic.

This crumbling stump is all that remains of what was once thought to be the oldest living organism.

A little stop along the Texas highway where Rock Hudson, Elizabeth Taylor, and James Dean stayed while shooting the 1955 film "Giant."

The world's tallest statue of an American hero.