Giant marble phalluses on the sacred island of antiquity.

A meow-velous tribute to a beloved street cat, made famous on the internet.

This crucial gathering spot along the "hippie trail" still displays old notes between traveling beatniks and backpackers.

Climb a steep hill in 90 seconds on the second-oldest urban subway in the world.

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

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

This museum was invented in a novel before being made real by the author.

A small etching on the white marble parapet was written in runic script by a Viking mercenary.

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

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

Roman politician Herodes Atticus built this nymphaeum to honor his wife, whom he may have murdered.

Its interior is adorned with some of the best examples of early Christian mosaics.

A forgotten "city of water" underneath the famous Trevi district.

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

Brass cobblestones mark the places where individual Holocaust victims were taken from their homes.

An abandoned Roman salami factory has found new life as an art space home to 200 squatters.

A fairy tale castle in modern Rome.

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

The final resting place of the poets Shelley and Keats.

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

The only "Egyptian" pyramid in Europe and the legendary tomb of Remus.

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

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

The largest and most famous wax anatomical collection anywhere in the world.