The scene of the duel with the knight with mirrors was shot here during the third week of filming.
Toby arrives at the castle and begins an affray with some sheep, and then in a very Monty Python-like scene, the fight with the knight takes place, all inside the ruined castle and finishing with Toby waking up kissing a sheep.
According to Gilliam, he had spotted the location as far back as 1990.