This frequently-photographed waterfall takes only a short hike to visit.

Ninety feet off the valley floor is an ancient dwelling put under protection of the U.S. government by Teddy Roosevelt.

A beautiful geyser under environmental threat.

The ghostly remains of an accidental sea.

The first declared National Monument in the United States.

Stepping away from the glitz of mobsters and casinos to learn about the other history of Vegas.

The deepest lake in the United States, and once the site of epic destruction that lives on in legends.

Stroll through a wonderland of stupendous moss-covered trees.

A 200-year-old bar in the historic French Quarter refuses to give up its place in history, nor its role in securing ours.

Explore the largest pure gypsum deposit in the world, and go dune sledding while you're at it.

A roaring, awe-inspiring double cascade of icy water flows through woodland Oregon like something out of a Tolkien novel.

Under the right circumstances, this waterfall in Yosemite briefly turns a luminescent fiery orange.

The only structure left with direct ties to the Salem witchcraft trials of 1692.

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

An early 20th-century bullring converted into a modern shopping center.

Catalonia Tradition: Beating the hollow Christmas log until it defecates in your fireplace.

This underground church is topped with a 500-foot cross that is seen by many as a beacon of fascist hubris.

Vibrant street art created with mixed media.

This sweet-toothed bear searching for snacks has been a symbol of Madrid for decades.

Spain's unique Mosque-Cathedral has been a place of worship for both Muslims and Christians throughout its history.

An eerie collection of the surviving structures from a past celebration of the future.

This amazing example of Valencian Art Nouveau looks more like a cathedral than a public market.

This lucky bronze frog was gifted to Madrid by a casino.

Holy Grotto of Montserrat Monastery holds one of Europe's mysterious black Madonnas.