The Brandenburg Gate was built by Rene Hoffmeister who runs the German Lego community 1000Steine. He is a Lego certified professional too.
So that was the 1000Steine-Land 2010!
This is a really great festival and the ticket pricing is ok (6€ for me, cause I'd to pay adult prices, 4€ for kids under 12 years). It's a good way to get a view inside the community and simply a great event. I will visit it next year again.