If you want to see a fascinating site, try this. It is just a collection of historical photos and even paintings that are grouped under a theme but really nothing seems to bind the collection other than being interesting to whomever is doing the collection. This is their own description of themselves:

Retronaut is a photographic time machine.

It is a digital collection of tens of thousands of pictures from across the past, all with one thing in common
– each one has the power to warp your sense of time .

Our team mines archives online and offline, unearthing pictures that seem not to belong to the time when they were created,
that dissolve away the years like tarnish on a ring, that take our collective map of the past and tear tiny holes in it
– holes through which we glimpse the real past lying underneath our map.

These are pictures that show not so much the past as they show “now” – but another version of now.

And just as fascinating is this, imgur.com. This is how I found this site when I was directed to this on rare historical images.