This massive airship factory is so large that it has its own indoor weather.

A secret hatch containing two parchments was discovered in this statue over 40 years after its installation.

This quirky museum has a collection of more than 15,000 bobblehead dolls.

In Rome’s Jewish ghetto, a 200-year-old bakery still makes the neighborhood’s historic sweets.

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

This unassuming bridge is most likely one of Michelangelo's unfinished masterworks.

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

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

The final resting place of the poets Shelley and Keats.

Rome’s legendary peephole vista is also a former Crusader stronghold.

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

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

This subterranean shrine beneath a bike rental store celebrates the iconic Italian scooter.

The best preserved Paleochristian basilica in Rome hides a number of oddities and secrets.

Charles Dickens was not a fan of the ghastly wall dressings in this 6th century church.

This small Roman arch was transformed into a dwelling by the founder of the Trinitarian Order.

A fortified medieval basilica on the Caelian Hill preserves extraordinary frescoes and one of Rome's most beautiful hidden cloisters.

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

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

One of several skulls claiming to belong to the beheaded St. John the Baptist is on display at this Roman church.

In the early Roman Empire, people deemed traitors and criminals were tossed to their deaths from this rock.

This small church was constructed over the ruins of three temples dating to the Roman Republic.

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

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