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

Not quite the menace it once was, this monster still has some chops.

A narrow passage next to a cafe leads to a courtyard exploding with murals, tags, and paste-ups.

No one knows how this Pacific Northwest spruce tree came to have so many trunks.

Tour the sci-fi-esque reality of governmental disease management.

The mysterious wonder of an underground waterfall is illuminated by multicolored lights.

Scores of vintage street lamps shine along L.A.’s Miracle Mile.

A modernist landscape of water and sci-fi concrete.

The 10,000 Torii shrine.

This semi-secret garden in south Seattle emulates a traditional Japanese garden using the plants of the Pacific Northwest.

A sacred site for Native Americans surveyed by George Washington and owned by both King George III and Thomas Jefferson.

This whimsical group of statues is a favorite of children who love to climb all over Lewis Carroll's beloved characters.

A winding path built in secret on the edge of the continent.

A scandalous Art Nouveau collaboration that set Paris all atwitter at the turn of the 20th century.

The world's longest known cave system.

The second-largest cave chamber in the world was discovered in 1898 by a 16-year-old and a friend known as "Pothead."

A beautiful geyser under environmental threat.

Possibly the most beautiful carillon in the world, set atop Iron Mountain in Florida.

Florida might be at its most surreal in this museum devoted to the famed Spanish artist.

A pair of slides and a tree-lined stair corridor have been an urban oasis for nearly 40 years.

The legendary birthplace of the Japanese maneki-neko is dotted with hundreds of lucky beckoning cats.

This incredible collection of vintage pinball machines can be played at 25 cents a pop.

This unique structure in suburban Austin is made up entirely of other people's castaways, and constantly changing.

The hike through a narrow river flanked by the 2,000-foot-tall walls of Zion Canyon is one of the best in the world.