Another great website is Britain from Above which has thousands of aerial photographs from the 20th century, some before the war.
www.britainfromabove.org.uk/
In the search boxes type the area and the country, then see what comes up. It can be difficult to find a decent view sometimes but persevere. The ones you see are just low resolution. If you find one you like then you can order it for £9.90. The resolution for the one I bought from 1946 was amazing, rather like an early version of Google. I could see cars, buses, shops and people, also churches and houses which have since been demolished. Well worth the money.