Basement flat periscope webcam and projector
Place the cam above your window and point it towards the street and project the image on the blank wall you see outside your window. You have a real-time view of everything you would see if you didn’t live underground!








You could also install a fake window, giving you the appearance of an outdoor view on your basement wall.
You can get the fake basement windows with an outdoor view here!
https://www.proskypanels.com/fake-window/
Check out this CCTV camera that connects to a projector! It might work in this situation.