X-Men: The Animated Series episode “Descent”
Reality-92131

This is a real street in London.
https://en.wikipedia.org/wiki/Mansell_Street

In 1888 Dr. James Xavier tracked Dr. Nathaniel Essex, who he correctly believed was behind the Whitechapel murders, to an upstairs flat on this street. He convinced a Metropolitan Police inspector (probably Frederick Abberline) to accompany him to the location, but all they found there was a bare room and a book that had belonged to Essex.

In reality one of the Jack the Ripper murders actually did take place near Mansell Street, in an alleyway: https://www.jack-the-ripper-tour.com/locations/swallow-gardens-royal-mint-street/.