Many people don't realize there’s a lot going on in—and below—the world’s tallest triumphal arch.

The real Buddhist temple where the fictional Kwai Chang Kaine (David Carradine) trained in TV's 'Kung Fu' series.

When it was built in 1929, this historic bridge was the only place to cross the Colorado River for 600 miles.

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

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

Life-size figures portray depot attendants, train crew, and passengers frozen in time at the oldest railroad station in Arkansas.

A home designed to be on the cutting edge of comfortable, low-cost living.

This one-room schoolhouse in rural Arkansas dates to the 1920s, but looks like it could be the 1820s.

Ninety feet off the valley floor is an ancient dwelling put under protection of the U.S. government by Teddy Roosevelt.

The Magic House provides a beautiful and creative environment for curious youngsters to get their knowledge on.

Giant granite rocks standing end-to-end like a train of circus elephants.

Erosion and time have created a naturally-formed water park.

It would take you approximately an hour and a half to walk to the end of Mexico's largest pier.

Tiny castle in the middle of the Rhine made you pay to pass.

A monument to the three wars that led to German unification towers within a Berlin traffic circle.

The prototype for all Nazi concentration camps.

Legendary site where an evil bishop was devoured by rodents.

The "Prussian Versailles" that is as glorious today as when it was built.

Ernest Hemingway wrote a good portion of "A Farewell to Arms" while living with the parents of his second wife, Pauline Pfeiffer.

A large stone map of Arkansas awaits visitors to its highest point.

Twenty-year effort to raise a castle using tools and techniques from the 13th century is now abandoned in the Arkansas woods.

An abandoned early-20th-century boomtown sits within the Calico Rock city limits.

The final remnant of the Arkansas zinc industry is this historically protected ghost town.

A mysterious light floating in the trees of Arkansas may be a piezoelectric effect.