Historic fortifications form the boundary of Vatican City, but it’s not entirely surrounded by walls.

Final resting place of Geronimo, Quanah Parker, and the first atomic gun ever fired.

Campus tradition says couples who walk beneath this enormous oak will stay together forever.

Decades of discarded bottle caps line this alleyway, a fixture of Texas A&M.

Home to the largest urban bat colony in North America, estimated at 1.5 million bats.

A registered historic landmark shrouded in unsettling local legends.

A "Texanic" (gigantic Texas) collection of Art Deco architecture at Dallas' historic Fair Park.

A trio of colossal statues spread across a Dallas neighborhood chart the emergence of a giant robot born of a locomotive and spilled gin.

This downtown Dallas art installation is always on the lookout.

The "world’s largest honky-tonk" also has its own indoor rodeo arena.

The man who wasn't there.

A Texas museum filled with Broncos and Betties.

Long tunnels run under the ancient chariot racing circuit to the tower.

This Roman arena once played host to bloody gladiatorial battles.

Stunning Roman aqueduct used for 1900 years and still standing.

This ritzy Italian market is built around a statue of an unforgiven heretic who was burned for his belief in an endless universe.

The crypts of Capuchin friars decorated with the bones of over 4,000 friars, including an entire "crypt of pelvises."

Hundreds of lucky felines haunt the ruins where Caesar was murdered.

A master of trompe-l'oeil creates a stunning, tourist-fooling dome out of a flat ceiling.

This former Roman Catholic Church still contains the embalmed hearts and organs of 22 popes.

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

The skull of the patron saint of lovers lies in the Basilica di Santa Maria in Cosmedin—maybe.

The yawning maw of this pagan visage is said to bite off the hands of liars.

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