I have found that MULTIMAP or similar of great help.
The main page lets you set where you want to go, like BERLIN. it covers all Europe for starters ! Start off with the normal map to your location and then go for AERIAL or BIRDS EYE view. I think it must come down to about 1500ft (HIGH). view your site North, South,East or West. Usual GRAB and ZOOM , print etc.....
Great to view those Wartime Airfields to see whats left. I used it to locate a Heinkel crash site. All this from your own Home!
www.multimap.com HAVE FUN with those Airfields... Jeff WEYERS