The mounds at this site were reconstructed with the help of archaeologists and historians.

The official atomic museum of the United States explores the explosive and productive history of a much maligned energy source.

The remains of Abó, Gran Quivera, and Qurai are monuments to the long, complicated history of the Indigenous people of the Southwest.

Pyramid home to an obscure religious group that practices modern mummification.

A classic mystery spot complete with spots that are said to make you shrink or grow when you stand on them.

The wooden airship was the largest flying boat ever built.

This café is dedicated to serving coffee roasted by Native American-owned companies.

The U.S. Navy's last diesel-electric submarine rests half-submerged in the middle of Portland.

The preserved remains of the former Milwaukee County Hospital for the Insane are hidden in the wooded grounds of County Park.

Recognized the world over as the home of the McCallisters in the 1990 movie "Home Alone."

Literally a million fascinating cartographic artifacts are held in this sprawling university collection.

A trailblazing sovereign nation tucked in the American state of Wisconsin.

One of Frank Lloyd Wright's final works was this UFO church.

Apparently, the whole cosmos emanates from this plain concrete tower.

This pseudo-steampunk weapons facility is the world's largest wood and glue structure, and packs quite a wallop.

The ruins of this former mining boomtown once housed over 3,000 people. Now, the population is two.

A warm desert spring holds one of the rarest species on earth.

With its webbed walls and bright red coloring, Calgary's iconic bridge looks like a finger trap puzzle stretched across the river.

A Bicycle Path in the Sky.

These modest Midwestern formations are kin to Niagara Falls' impressive cliffs, more than 600 miles away.

A small metropolis of Pueblo cave dwellings have been carved right into the hillside of this national monument.

These ruins of a pre-Columbian cliff village are among the most beautiful and well preserved in New Mexico.

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

A phenomenal assembly of pueblos in New Mexico is the most complete example of ancient ruins north of the border.