The remnants of the base where US Army troops learned how to fight in extreme conditions.

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

A remote sandstone plateau named for a legendary cattle rustler.

This interpretive path lets you get up close and personal with dinosaur bones.

A natural formation that resembles a camel resting in the New Mexico desert.

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

A river runs through this remote valley in a very unexpected way.

Two creeks flow out of either end of this canyon in opposite directions.

The park is home to the United States's only still-operating Dutch windmill.

This spectacular track has run continuously since 1882.

One of the few working locomotive roundhouses in the United States.

Its history includes dinosaur fossils, cattle rustlers, Georgia O'Keeffe, and a mythical giant rattlesnake named Vivaron.

This general store is a one-stop-shop for workers at the Prudhoe Bay oil field.

The walls of America's oldest masonry fort famously "swallowed" cannonballs.

The fifth-longest natural arch in the world, and the longest outside China.

This historic street in Quito is known for its seven stone crosses—and one presidential assassination.

Few things look more out of place than the electric blue ponds in the reddish-brown desert of Utah.

This sparsely populated town offers a look back in time.

Within the former ghost town of Cisco is a carefully restored tiny town with one resident and its own art residency.

This huge green space packed with activities will make you forget you're in the middle of the Ecuadorian capital.

A short volcanic hill in Quito doubles as a stellar observation point of an iconic statue.

Built on the remains of one the Incas’ most important gathering spots, this square keeps the spirit of a fallen empire alive.

Ecuador’s historic seat of government has been quietly looted in recent decades, and no one knows how or by whom.

This demon atop the Notre-Dame de Paris looks utterly bored.