The first railway tunnel to cross the Continental Divide and, at 11,523 feet, was once the highest railroad tunnel in the world.

Amazing views of Long Island Sound can be seen from this mountaintop tower.

An easy-to-reach, century-old shipwreck in shallow and crystal clear waters.

The only cave in Louisiana has played host to a state's-worth of clandestine activities.

One of the oldest carousels in the United States is still running in the coastal village of Watch Hill.

At the largest railway museum in the United States, you can see everything from an early steam engine to a functioning Thomas the Tank Engine.

Traversing these canyons, visitors can take in stunning views and glimpses of the region's history.

You’ll feel like you’ve gone through the looking glass at this contemporary art museum filled with glass sculptures of every size, shape, and color.

Away from the crowds of fishing enthusiasts, take a hike deep into the woods and journey into an eerie darkness.

This stimulating sex toy museum is sure to arouse the interest of its visitors.

One of the most extensive and well-preserved collections of dinosaur footprints in North America.

A reproduction of earth's many biomes.

Crafted in 1911, this steam locomotive spent its entire working life in Flagstaff.

Some 10,000 works of ancient rock art cover these volcanic basalt outcrops near the Gila River.

Petroglyphs, bird watching, and a 100-year-old Ranch in one location.

This Native American settlement dates back to the Pueblo II period.

The installation’s official name, “You Who Are Getting Obliterated in the Dancing Swarm of Fireflies,” says it all.

Largest collection of mounted dinosaur specimens in the world.

A strenuous, unofficial trail leads to spectacular views in one of America's most remote national monuments.

One of the world’s largest collections of petroglyphs records 2,000 years of human activity.

This roadside stop between Goblin Valley is the perfect location to view some of the region's natural wonders.

The unusual patterns in this rock formation result from two distinct modes of weathering.

Erosion and various mineral deposits give this striking canyon its distinct color and soft appearance.

A tunnel with windows, so you don't miss out on the impressive views.