Mother Nature outdoes herself with this stunningly beautiful set of caves carved into marble.

A salty red wasteland in Tanzania is a breeding spot for endangered flamingos.

A burial vault located under Tiber Island in the middle of the Italian capital.

Romans decided this 16th-century "talking statue" was so ugly, they named it after a primate.

Rome's first modern graffito is all that is left of a peaceful protest from the 1970s.

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

This hidden alley near the location of Rome's first theater was the site of a curious miracle.

At the crypt of St. Mary of Eulogies and the Dead you are left alone to ponder mortality among piles of skulls.

The Pope’s secret escape route.

This large, circular tomb is the final resting place of the first emperor of Rome.

A hospital where antique dolls are given new life.

This ancient Roman prison is decorated with an upside-down cross not as blasphemy but as saintly tribute.

St. Francesca Romana, patron saint of drivers, resides in the church she founded.

This statue is the only female representation of Rome's "talking statues."

The spot where the fascist dictator made some of his most famous speeches including declaring war on Britain and France.

The only retired U.S. nuclear missile silo that is open to the public.

A century-old cabin off of Highway 30 touts an unusual construction material: dinosaur bones.

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

Roman-era ships unearthed...

A monumental fountain in Rome features a large statue of Moses that has been criticized for centuries.

Architectural monsters are devouring this palace's every door and window.

Inside this building is another country within Rome, a sovereign entity without a physical territory.

This basilica is dedicated to two saints, one of which is known more for his famous quote.

Rome's semi-secret peephole vista is also a former Crusader stronghold.