Limestone caves with spectacular showcase chambers.

A massive collection of rare and antique books in a tiny ranching community in northern Texas.

It's where the final scene of the beloved Tom Hanks movie was filmed.

One of the Eight Wonders of Kansas and the first official National Natural Monument these stark formations look like nature's Stonehenge.

A natural rock formation believed to be a cure-all.

A half-size replica of the World Trade Center towers above Tulsa.

Once in disrepair, the house where the 1983 film was shot has been restored and turned into a museum.

Rare and gorgeous birds abound in this protected wildlife sanctuary.

When in Idaho, sleep in a giant potato.

A clear blue swimming hole with hidden caves, still unexplored.

The Grand Canyon of Texas.

Once a lonely sentinel on the edge of the Great Plains, this rebuilt trading fort offers a glimpse of life on the Santa Fe Trail.

This marker identifies the location where three states converge.

This tiny cabin was home to one of Iceland's most famous painters and was the only land he ever owned.

A trio of hidden hot tubs takes advantage of Iceland's natural geothermal vents.

A fantastic reconstruction of a 10th-century Viking longhouse.

Inside this museum, visitors venture through ghost stories entrenched in Icelandic folklore.

This hobbit-y little hot spring may be the oldest spring used by humans in all of Iceland.

Learn about Iceland's hidden folk at this school dedicated to the study of elves.

This verdant, tree-lined Reykjavik graveyard is both enchanting and eerie.

A monument dedicated to the civil uprisings that took place during the Pots and Pans Revolution.

The largest whale museum in Europe allows visitors to walk among life-size giants.