Perfume museum and library.

1920's reinforced concrete church by architect Auguste Perret changes the face of modern design.

The industrial architecture honors the laborers who brought the Exposition Universelle of 1900 to life.

Saintly bones pressed into a wax effigy of a Catholic superstar.

Dishes are packed with flavor at one of the only Singaporean restaurants in Paris.

An unusual "skull with ears" sits in the crypt of this small church tucked away at the end of a narrow alley.

This shining multicolored metro station deep under Naples is said to be the most beautiful in Europe.

The mystic whose incorrupt corpse still attracts the faithful.

A collection of objects supposedly singed by the hands of souls in purgatory.

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

One of the oldest and most significant collections of Ancient Egyptian archeology outside of Egypt.

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

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

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

An alchemist's "magic door" stands in the middle of a Roman park.

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

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

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

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

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

The astonishing collection of an infamous criminologist.

A fake medieval village in the middle of Turin.

This Art Nouveau mansion was used as the "House of the Screaming Child" in Dario Argento’s giallo classic.