We have used old real maps. Pick them up cheap from charity shops.
Ignore anything anachronistic, eg used some tourist maps of Rhodes.
For ancient games the Airport doesn't exist

,
but for the WW2 games it is a great objective.
Real maps pose real problems.
Using one, for pre-battle manoeuvres during a 7YW game, I found
myself having the kind of problems a real commander might face.
The 'best' battlefield for me was about half way between my Saxons
& my opponent's Prussians. He can get his army across country much
faster than I can move mine, so dare not try for that one. You find yourself
thinking thing like, 'I could anchor my left flank on that river, but if I
garrison that village on my right, the army is going to be very thin in
the centre, OR 'That ridge line would give me an advantage, it is only
two days march, so I'd have time to build some defense works on the weak left,
BUT he could advance through that large wood on my right & attack from there.
Try it, you only have some cheap/out of date maps to lose.
Also useful for made up 'countries'
e.g. I took an old map of Warwickshire (UK) and a large felt tip pen.
Decided that Post Apocalypse Britain had been flooded to a depth of

? feet. Take the pen & draw along the appropriate contour line.
You now have islands & a totally new terrain. If you want the land
bigger, reduce the flood (use a lower contour line). Islands smaller?
Increase the flood (use a higher contour line).
Next use some cheap paint (I used Matchpots) to colour in the 'sea' .
Then you have the basis for (in my case PA campaign) your 'world'
Tribal groups were based on/near urban conurbations (were survivors
would gather) Birmingham gave rise to the Brum Tribe. The people
of the Wolf (formally Wolverhampton). I already had tribal colours
(Local football teams) & banners (Wolverhampton= a wolf's head)
Explain away anomalies with some back story. The Motorway, which
went over islands, but disappeared beneath the waters, well that was
the road of the Gods. Only Gods can walk through the seas, and look
how BIG their road is! Gods are hugh.
Added bonus, other maps are available if you want to expand.
To further throw off the players, turn your map so that the top is
East (the rising sun) & not North (which needs a compass). That
was how a lot of old maps were drawn.