This popular pilgrimage site offers a hole filled with holy healing dirt.

Twenty-seven massive radio antennas on the high plains of New Mexico search for life on other planets.

A unique geological area spiked with wind-carved rocks that resemble teepees.

This National Natural Landmark is one of the best examples of a “mass wasting” in the world.

A hotel with a rich Wild West history of miners and bootleggers.

Once a lonely sentinel on the edge of the Great Plains, this rebuilt trading fort offers a glimpse of life on the Santa Fe Trail.

Air Force Academy Chapel made of 100 identical tetrahedrons works to inspire those of all religions.

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

North America's first frozen mummified remains of an ice age steppe bison, the 36,000 year-old mummy named "Blue Babe."

The king of U.S. high points towers over every other peak on the continent.

This is one really big nut.

London's smallest police station is barely the size of a phone booth.

Legend says these colorful, invasive residents are the descendants of birds released by Jimi Hendrix.

The largest stone circle in the world has ended up bringing up more questions than it has answered.

"Only the devil could play golf here."

Formerly known as National D-Day Museum, this collection commemorates the battles of Normandy and WWII.

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

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

A sprawling collection of over 106,000 toys from around the world.

This elaborate towering structure was once famed for its revolutionary height.

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

This monument on Breed's Hill proves that one of the most famous battles of the Revolutionary War is misnamed.

The history of the tea trade is told in bas-relief on this historic pair of Boston doors.

This landmark cemetery in Boston was created more than 300 years ago.