Today, the filmmaker has shared one of the immense set designs he is working on while in pre-production in Montreal. While he wouldn't specifically say which set this is, you can check it out below and speculate yourself.
Going through set designs at Mell's studio in Montreal. twitter.com/BryanSinger/st…— Bryan Singer (@BryanSinger) January 30, 2013
X-Men: Days of Future Past comes to theaters May 23rd, 2014 and stars James McAvoy, Michael Fassbender, Rose Byrne, Jennifer Lawrence, Nicholas Hoult, Patrick Stewart, Ian McKellen, Hugh Jackman. The film is directed by Bryan Singer.