There is a forum in Germany and Austria called Gipfelquiz = summit quiz
I think it's a nice idea and it makes a lot of fun.
1) If you think you have the right answer, DON'T tell the name of the mountain.
2) Give the checksum of the altidude plus the last number of altidude.
For example: If you are thinking the picture is taken from Mattehorn 4.478
say "23/8" (checksum 4+4+7+8=23 plus 8 last number)
But you can also guess the region
Here is an easy one:
Where is the picture taken from?