re: OT marriage proposals. How and where did you propose?

Went to Oktoberfest, then took train to Prague and on last day of the trip proposed on the Charles bridge. It was a surprise and she didn't expect it b/c it was at the end of the trip (they are trained to expect engagements at the beginning of vacations).
I lucked out and got a young Spanish couple in the old I'll take a pic of you guys if you take one of us so I have a picture of it.

Yes I did ask for the parents permission. They lived in Dallas so I had to Skype.

I think the key, more than anything is understanding that it will be a thing she'll want to remember, so find a place or landmark (doesn't have to be fancy or even one that holds significance for you two currently).