Wedding chapel's mysterious spiral staircase said to be miraculously constructed.

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

This is one really big nut.

Legends surround this jagged rock formation in the New Mexico desert.

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

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

A museum dedicated to the alleged Roswell Incident.

Modeled after a famous church in Vienna, Austria—but in Helena, Montana.

For thousands of years, Native American hunters drove buffalo straight off this cliff in Montana's Yellowstone Country.

An apocalyptic seismic event creates a deadly chain reaction that ends with a 6-mile long lake developing within weeks.

The only road through the heart of Glacier National Park.

New fungal and bacterial species call this deadly lake home.

Two hundred tons of pioneer artifacts were painstakingly recovered from a shipwreck at the bottom of the Missouri River.

European castle ruins in an American state park are actually the product of death and grief.

The only arched bridge made of stone on the entire Mississippi River.

When flour explodes, it's not a pretty sight.

The fifth-longest suspension bridge the world, connecting one Michigan peninsula to another.

A sealed test tube said to hold Thomas Edison's dying breath was given to the inventor's friend and mentee, Henry Ford.

Astounding collection of coin-operated games and automata.

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

Inspiring Herman Melville and Henry David Thoreau, Mount Greylock in western Massachusetts is the highest point in the state at 3,491 feet above sea level.

The site of Paul Revere's historic two lantern warning.

Berthed at the Charlestown Navy Yard in Boston, "Old Ironsides" is the oldest commissioned warship still afloat.

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