Dealey Plaza. Yes, the fateful place in Dallas at the intersection of Main and Houston streets, home of the Texas School Book Depository, the Triple Underpass and everyone's favorite place for nonexistent gunmen to hide out, the Grassy Knoll. Will soon include an open-topped limousine with six passengers, plus some dude up on the sixth floor looking to prove the Single Bullet Theory. Also a couple guys with movie cameras. Zapruder and (Oliver) Stone, of course.
[I wrote the previous paragraph around the time I read the excellent book "Case Closed", about the Kennedy assassination. Plainly, without baseless innuendo or paranoid speculation, it lays out the simple known facts around the assassination, showing convincingly that Oswald acted alone. I checked out some conspiracy-theory guy's followup book called "Case Open", and was not at all impressed.]
However, I don't really think the Kennedy assassination is really a fit subject for Lego constructions.