The Chicago Tribune has a gallery with some long-forgotten photographs of the Chicago Exposition of 1893. It’s a visual treat for Victorian era enthusiasts. And while you’re at it, I highly recommend the book “Devil In The White City,” a true-crime story about a serial murderer n Chicago at the time of the fair.
Here’s a set of color photos of Victorian Wales. There may be some use here for people making terrain.
The Victorian Dictionary is an online encyclopedia focusing on Victorian London. Its a great resource for fans of Victorian gaslight horror.