Staircase winds down the side of Telegraph Hill through gardens, wild parrots flying overhead.

Millions of years of oxidation make a drive down this winding Death Valley road surprisingly colorful.

The lowest point in North America is home to an undrinkable pool surrounded by fields of geometric salt flats.

Ten 25-foot-tall, beehive-shaped kilns, abandoned in Death Valley.

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

One of the most scenic stretches of road in America winds between some of the country's oldest trees.

Moonbows over Kentucky.

A bizarre roadside attraction and the first instance of miniature golf in the world.

Half of a waterfall goes into the river while the other half seems to disappear.

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

You can climb to the summit of Black Mountain, as long as you sign the waiver.

A 300-yard long natural tunnel runs through a ridge deep in the Appalachian Mountains.

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

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

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.

The first declared National Monument in the United States.

A bizarre house filled with an astounding array of collections.

The ancient tomb acts as a calendar that keeps perfect time.

An Irish church where an 800-year-old mummy is reaching out of his coffin as if to shake hands.

The gorgeous library at Trinity College is home to remarkable treasures of Irish identity.

The modern birthplace of Irish freedom.

Iceland's largest lagoon is home to stunning multi-colored icebergs.

The unique waterfall in Iceland's south features a backdrop of geometric black lava columns.