A fitting attraction for the corn capital of the world.

The world's longest known cave system.

The American Revolution was galvanized into serious action due to the tragic clash with British soldiers that occurred at this location.

See massive fossils that are over 200 million years old in northeastern Arizona.

The first declared National Monument in the United States.

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

This 4,000-foot-diameter hole is touted as "the most well known, best preserved meteorite crater on Earth."

Macabre headstones carved with winged skulls, dancing skeletons, and pithy reminders of impending death.

A walk through the historic city center, under the streets of Seattle.

This iconic Parisian bookstore doubles as the "Tumbleweed Hotel" for traveling writers.

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

The magic's in the hole!

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

The celebrated eyesore created by starry-eyed sweethearts.

A giant Troll lurks under one of Seattle's oldest bridges.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

A former waterfront market is now in the center of town due to some interesting Boston engineering.

Visitors to this library are in for a real-world education in modernist architecture.

This record-setting hydraulic dam in the Montana badlands was one of FDR's most ambitious public works.

"Polynesia on the Plains."

The world's first nuclear power plant is open to visitors looking to role-play a meltdown.

These giant metal horses graze on a hilltop near the Montana highway.

The highest point in Montana is as rugged and singular as the state itself.

No Gordon Lightfoot song, only a barebones monument to greed.