The oldest family-run luncheonette in New York, last renovated in 1948, still serves food and drinks the old-fashioned way.

Nikola Tesla's former home contains an homage hidden from plain sight.

The venerated body of a 12th century saint is celebrated each year with the 'Race of the Candles.'

A sinister pyramid in the Frari contains the heart of the famous neoclassical sculptor.

Two stone columns flank the grand Venice square, but there were supposed to be three.

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

A Milanese café entirely designed by the American director Wes Anderson.

The martyr's wax-enhanced skeletal remains lie preserved in a glass case in the Santa Maria della Vittoria in Rome.

A stunning cemetery famous for its extraordinarily delicate & lifelike mourning sculptures.

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

One of the world’s smallest bars, just 13 square feet, is brimming with speakeasy flair.

A dismembered holy head stares out from her beautiful reliquary at the St. Dominic Basilica.

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

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

Skulls from the plague of 1656 and World War II bombings are united by a cult dedicated to caring for the ancient dead.

Jesus' footprints and the first catacombs in the world.

The doodles of a genius line the walls of a secret room under the Medici Chapel, where they were hidden for nearly 500 years.

Sitting on an Italian hilltop is this surreal fortress built by the mad inventor of electrohomeopathy.

An ossuary built in 1210 to collect bones from the Ospedale Maggiore of Milan.

2300-year-old Roman road connecting the empire.

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

This Venice bookstore has resigned itself to constant flooding by keeping its books in bathtubs and boats.