"If you’re looking for macabre attractions, there is no place quite like Rome, thanks to the Catholic tradition of preserving and displaying relics of canonized saints for all the world to see. And there is no place in Rome quite as marvelous as the Santa Maria della Vittoria for that reason." Source: Atlas Obscura.
"While relics are often just parts of saints, this beautiful baroque church displays the full corpse of an 'incorruptible saint' in a glass case you can walk right up to to view — a rarity in Rome. This is the preserved corpse of the beautiful Saint Victoria."
Comment: I don't know where to start. First of all, this isn't a miraculously preserved corpse but a wax figure containing a (partial?) human skeleton decked out with a dress and someone else's hair. Second, there's no telling whose skeleton this is. Phony relics aren't exactly unheard of in the church, so the skeleton could be the remains of a common street prostitute or a pagan witch for all we know. Third, the Catholic fascination with displaying body parts and the "incorruptible" bodies of saints is grotesque and morbid. Fourth, the only reason that Victoria is a saint is because she stubbornly refused to marry a pagan and was eventually executed for being a Christian:
"Their legend recounts that, in the time of the Emperor Decius, Anatolia and Victoria were sisters whose marriage was arranged to two noble, non-Christian Roman men. They resisted matrimony and their prospective grooms denounced them as Christians. They received permission to imprison the women on their estates and convince them to renounce their faith. Anatolia's suitor, Titus Aurelius, gave up, and handed her back to the authorities. Victoria’s suitor, Eugenius, was more persistent, but also ended up returning her to the authorities." (Wikipedia)
This is a bizarre story, but it's possible that Victoria was executed for being a Christian since some persecutions did happen under the reign of the obscure Decius. According to Wikipedia, "During his reign, he attempted to strengthen the Roman state and its religion, leading to the Decian persecution, where a number of prominent Christians (including Pope Fabian) were put to death." (Wikipedia)
If Victoria and her sister existed and were actually executed, they were ultimately killed because they must have refused to perform a sacrifice to the Roman gods and the well-being of the emperor according to the edict of Decius. This was the standard Roman loyalty test. The polytheistic Romans didn't care what you believed in as such. They just wanted to make sure you weren't a threat to the state and traditional Roman values.