A perfectly circular lake is formed by the crater of an ancient underwater volcano.

This fairy-tale, neo-Gothic church in the Azores is a world of magical realism.

This abandoned five-star hotel is now a five-star urban exploration destination.

This massive stained-glass masterpiece is thought to be the largest Tiffany dome in existence.

The U.S. Navy's last diesel-electric submarine rests half-submerged in the middle of Portland.

One of nature's most well-scheduled phenomenons resides in Wyoming's Yellowstone National Park.

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

A beautiful geyser under environmental threat.

The first declared National Monument in the United States.

A fitting attraction for the corn capital of the world.

A striking sculpture built to honor the women of the Lakota and Dakota Nations.

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

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

Just a man taking his prehistoric pet for a stroll.

True to its name, this bouncy walkway may be the world’s smallest suspension bridge.

The only house in Oregon designed by the famous architect, Frank Lloyd Wright.

Home of Howard Hughes' Spruce Goose.

The wooden airship was the largest flying boat ever built.

A logging-themed roadside restaurant surrounded by museum-quality machinery and artifacts from the industry's heyday.

This unassuming cheese empire in rural Oregon churns out more than 150,000 pounds of cheese each day.

A tourist attraction founded around a slumping cabin.

Despite a legend that says this highest peak in Oregon was climbed in high heels, scores of people have died on its slopes.

A collection of colorful dinosaurs hidden in an actual rainforest.

You might know it as the Overlook Hotel, but the inside is not going to be familiar.