That's one obvious flaw - not so much for 80x25 terminals, but Braille-readers and similar: how exactly do blind people draw on a map they can't see? Passwords are fine, they can touch-type, but a map?
Even an 'obvious' location won't be as obvious as a password of 'password' though: ok, the Eiffel Tower is a major landmark - but so's the Empire State Building, Niagara Falls, the Leaning Tower of Pisa ... if I were to tell you I'd picked an obvious major landmark as mine, which would it be?
My brother might pick the church he got married in - or the hotel the reception was in, or the one the honeymoon was in. Or maybe the first school we both attended, or the house we lived in at the time (both in the countryside, so easy to pick out on a map) - ALL 'obvious' places to someone who knows him well, so which would it be? Those span two continents and only one is within a few miles of his home, and I could think of another dozen equally "obvious" places he might pick instead.
Compare that with the usual: mother's maiden name, place of birth, siblings and offspring? All listed on Facebook, for a lot of people! Much easier to find. Add a hint like "bad NY hotel" and you have a specific building I could find in 10 seconds on Google Maps - and it's not in New York, either, that would be too obvious.