At the time of its completion, it was the tallest dam in the world.

The only road through the heart of Glacier National Park.

For thousands of years, Native American hunters drove buffalo straight off this cliff in Montana's Yellowstone Country.

The only natural lake in the world that drains into both the Atlantic and Pacific Oceans.

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

A beautiful geyser under environmental threat.

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

The first declared National Monument in the United States.

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

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

A cemetery housing wild west legends in South Dakota.

One of the few remaining casualties of the London Blitz, this destroyed church has become an enchanting public garden.

Island where motor vehicles are banned -- home to the only carless highway in the United States.

The fifth-longest suspension bridge the world, connecting one Michigan peninsula to another.

Turnip-shaped island just off the Michigan shore in Lake Huron.

During the summer, surfers in Alaska take advantage of this inlet’s unusual water patterns.

Considered by many to be one of the most dangerous highways in Alaska.

Buy your friend a drink or staple some cash to the wall for the next guy at the Salty Dawg Saloon.

A place to eat for on-the-run agents and espionage enthusiasts.

This striking art museum holds an amazing series of curiosity cabinets.

What appears to be a wizard's lair in Milwaukee actually houses a massive water pipe.