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Unbreakable Fortresses

How many unbreakable fortresses do you know of? What are the most common ones? I'm trying to make a study pertaining to this, but, honestly, I do not know of very many fortresses. Feel free to comment!
In game 6 of the Brains in Bahrain Man-Machine match Vladimir Kramnik vs Deep Fritz 15 October 2002 Kramnik resigned after move 34...axb6. However, analysis of the game shows that Kramnik could have reached a fortress!
Here is my uploaded, annotated version of game 6:
en.lichess.org/D9aLo9An#89

Here is the fortress position that Kramnik could have reached:
8/5k1p/5q2/8/1R6/6P1/5P2/6K1 b - -
lichess.org/editor/8/5k1p/5q2/8/1R6/6P1/5P2/6K1_b_-_-

The position after move 45.Rxb4 is a dead draw because white has achieved an impenetrable fortress!

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