The top of a giant mesa, just outside of Amarillo, appears to float in the sky above.

The national park was once a plantation estate.

This surprising gem is a world-class archeological museum hidden at the University of Chicago.

A wax effigy of St. Valentine hides one of the saint's relics.

An old railroad grade built for the construction of Hoover Dam is now a recreational trail featuring several tunnels and sweeping views of Lake Mead.

A Swedenborgian glass church surrounded by redwoods sits perched atop a massive landslide area.

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

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

Named for the 39 tribes that live in Oklahoma, this restaurant's menu deliciously highlights local flavors.

This narrow path was cut right into a French mountainside to feed the country's early naval expansion.

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

This gallery commissioned by Cardinal Spada is known for its magnificent optical illusion.

This Italian stadium makes liberal use of fascist statuary to evoke classical sporting arenas.

The engineering wonder and pleasure dome of a much-maligned emperor still holds undiscovered secrets.

Architectureal fantasy quarter of Rome.

This hidden Art Nouveau courtyard is an opulent feast for the eyes.

An alleyway plaque is all that remains of the independent Texas' envoy that forgot to pay their rent for over a century.