The legendary building that needed ghostly approval before being built.

This restored eighth-century palace is a shining example of ancient Umayyad architecture.

The most gigantic, swoony, intimidating trio of fingers in all of antiquity.

This exceptionally well-preserved ancient marvel also houses a small museum dedicated to Jordanian folk tradition.

The Pope’s secret escape route.

This is the oldest Roman-made bridge in the city still existing in its original state.

This medieval church in Rome was almost destroyed following a terrorist attack in 1993.

A Nesting Doll of Churches.

This palatial spiral staircase was so unusual the name "snail" was given to the noble family who built it.

A new sculpture calls attention to climate change in the centuries-old city it threatens.

On a small Slovenian island, diners can mix and match a classic cake into dozens of sweet and savory flavor combinations.

This abandoned Slovenian military barracks has become a punky-political art squat.

A whimsical bridge adorned with decorative dragons.

A peculiar museum that includes many drunken tales, a drunk driving simulator, and much more.

A World War II evacuation tunnel turned into a history display of Croatian state and people.

This stunning, out-of-the-way Croatian monument commemorates a community's uprising against occupying fascist forces.

A tower marking the spot where Yugoslavia began its resistance against the invading Nazis stands neglected, but not quite forgotten.

This truly palatial work of Communist-era architecture now sits crumbling on a Croatian beach.

A marvel of Byzantine engineering under the streets of Istanbul.

Legend says if you stick your thumb in the hole and it gets wet, your wish will be granted.

Five sultans and their families rest in eternal splendor, teeming with overlooked beauty and drama.

This column celebrates Rome's victory over the Goths, and may be the oldest Roman monument in Istanbul.

One of the newest mosques in a city filled with thousands.

An underground network of massive stone arches and their skylit vaults support ruins of portico structures above.