More sculpture than building, this architecturally significant temple was built on the spot of Saint Peter's crucifixion.

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

The "Great Sewer" of ancient Rome is one of the oldest sewer systems in the world, and is still in use.

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

The final resting place of the poets Shelley and Keats.

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

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

A fairy tale castle in modern Rome.

Architectureal fantasy quarter of Rome.

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

A hospital where antique dolls are given new life.

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

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

A sculpture serving as an homage to Pope John Paul II.

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

The site of the famous Nazi book burning campaign of 1933 remembers its "Night of Shame".

Mummified monks and the accidentally interred, in a 17th-century crypt.

This hanging crocodile is thought to be the "dragon" that once plagued a Czech city.

Despite attempts by local police to discourage it, Beatles-inspired graffiti has been a means for artists to air grievances for decades.

Macabre astrological automaton clock dating to the late 1400s.

Europe's second largest ossuary wasn't discovered until 2001.

This tipsy office building in downtown Prague was originally called “Fred and Ginger.”

A peculiar clock commemorates a historic victory won by ringing the noonday bell an hour early.

The silly symbol for an underground protest group is now scattered around the city.