If you are fascinated by architecture, you'll love this church. It is very beautiful, from top to bottom. Be sure to get the discount if you get the Berlin Welcome Card. We stopped here on a Sunday afternoon, and the crowds weren't bad at all. It was a nice relief from the heat outside, and it was nice to be able to sit on the pews to take a break from walking around. You could spend a good 30 minutes just marveling at the inside of the church, though you may want to allot about 2 hours for the full experience. Just a tip: the higher up you go within the church, the more narrow the stairs get. If you want to go to the very top, make sure you're not already tired out. Be sure to go down to the bottom of the church to the crypt, where many members of royalty lay. We found it to be the most interesting part of the experience, and we almost skipped it!