The spot in the Mile-High City that's exactly 5,280 feet above sea level (at least for now).

A downtown park built on top of unclaimed graves.

This spectacular track has run continuously since 1882.

The Denver airport is guarded by a 32-foot-tall sculpture of a demonic horse.

The largest source of fossilized insects anywhere.

Thanks to a quirk of elevation this gift shop produces magic doughnuts that are found nowhere else on Earth.

When ecosystems collide in the arid Southwest.

Once a mortuary that held the remains of Buffalo Bill, this Denver hotspot is now a death-fixated restaurant.

Strange red rock formations that have been attributed to a higher power for hundreds of years.

This volcano rises like a giant anthill from the plains below, with a road spiraling up to the rim.

This is one really big nut.

A multi-storied adobe complex has been inhabited for more than a thousand years.

Explore the largest pure gypsum deposit in the world, and go dune sledding while you're at it.

Infamous marsh filled with toxic waste, World War II-era London rubble, and dead mobsters galore.

The highest point in New Jersey is marked by a massive, if simply named, obelisk.

These unassuming lighthouses have seen the first reading of the Pledge of Allegiance, the first wireless transmission, and more than one mystery.

Vacant Beaux-Arts buildings that serve as reminders of a beach town’s glory days.

This ominously named New Jersey street seems to be attracting over-the-top legends of its own making.

The rusting remains are visible sticking out of the waters of the Delaware Bay.

This dramatic rail curve was once the target of a failed Nazi attack.

A field of nothing but boulders which resembles a giant's gravel driveway.

This jail which was in service for over a century is now open for curious visitors.

A local prank turned town icon.

It would take 35 firetrucks to fill this enormous glacial pothole.