The winding route passes through an enclosed alleyway, two tunnels, and leads to the White House basement.

A nostalgic bibliographic gem.

The site of the climactic scene from the classic horror film is now a historic landmark.

The most metal church of all time was built in record time because of an international, pious pissing contest.

An Art Nouveau gem hides beneath the layers of city grime obscuring this once-magnificent building.

Ancient serpentine sacrifice holder that has stood the test of time.

This remarkably well-preserved Egyptian plinth is pretty well traveled for a giant piece of stone.

1513 Turkish world map, full of European state secrets and snarky commentary.

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

A marvel of Byzantine engineering under the streets of Istanbul.

Sky ships, planes, and portraits left as unique tokens of hope and thankfulness.

Balconies that have a most unusual accent.

This small red school was where Germany signed their surrender during WWII.

A French library that makes sure its love of books is writ large... giant in fact.

At Monet's beloved home you can still see the Japanese bridge, waterlilies, and weeping willows that were the subjects of some of his most iconic paintings.

A treasure trove of Renaissance-era funerary art in a Roman church built on top of Nero's grave.

One of Catholicism's four major basilicas has a series of papal portraits that are said to predict the end of the world.

Stone memorial that's said to predict the death of the pope and the site of the Cadaver Synod.

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

A mysterious chasm in the heart of the ancient Roman Forum, the Lacus Curtius was once believed to be a gateway to hell.

Installed in an act of one-upsmanship, the annual sundial in this church is also a symbolic victory for the Gregorian calendar.

Museum dedicated to literary greats of the Romantic Period is also the home in which Keats met his untimely end.

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

Hidden beneath the famous St. Peter's Basilica is a veritable city of the dead that may hold the remains of St. Peter himself.