Crowdsourcing service will allow you to see how your city looked like many years ago.
PastVu - site, which a few years ago was a resource with rare archival photographs of Moscow, but now includes images from many corners of the Earth. As the authors Ilya Varlamov and Alexey Duk say, it is "a project to collect evidence of the past in photographs, a look at the history of the human environment."
When you enter the site, you will see a world map with lots of pictures. You can zoom in on the map and see what streets or buildings looked like in the past. When you hover your mouse over the thumbnail of the photo you can see when it was taken, when you click — look at it in full size. Just below is a description of the picture, the name of the author, the source, and even in what direction the photographer was shooting.
It is possible to filter the images on the map by selecting only photos or only pictures. At the bottom there is a slider with which you can remove pictures taken in a particular period. You can also choose which maps to work with: OpenStreetMap, Google or Yandex.
PastVu has attracted the attention of many Russian-speaking users, so from the comments to the pictures you can learn a lot of interesting things: residents of the former Soviet Union are actively involved in the development of the project. You can open a photo of the square on Gorky street in Moscow and accidentally find out that the house behind the scenes fell off the tiles, so the building was around the perimeter trimmed with mesh. And there are many such examples.
PastVu belongs to the category of projects that are better considered personally.