Spoilers and videos (including four from fans) ahead…
"Public Square was transformed into Stuttgart Germany, complete with street signs, banners, and even a marquee over entrance to the site of the former Higbee's Department Building–all written in German.
According to one of the movie's extra, Terminal Tower was being used as a museum, and the extra told NewsChannel5 that the character Loki, played by Tom Hiddleston, killed someone in front of hundreds of museum visitors and was making his getaway when the police arrived. Hundreds of extras were seen running in fear multiple times from the set.
The most exciting part of the night came at around 2:30 a.m. when the crew used a pneumatic ram mounted in the rear of a German police car to flip it onto its roof. The setup for the stunt took a few hours and had to be done twice because the first time the car did not flip completely onto its roof."