You got a present there for Peter?
In 1988, a young boy named Peter Quill sees his mother die in a hospital before being abducted by aliens.
The filming location for the Hospital interiors was the Hemel Hempstead Hospital in the UK
St Charles, MO – Ext Hospital
Peter Quill runs outside crying after his mothers death and is abducted by the Ravagers. According to MovieMaps.org this sequence was filmed at the production’s home studio of Longcross. The exteriors look nothing like the area outside the hospital used for the filming of the interior, so this location is a good possibility for the exteriors.
(Guardians of the Galaxy, 2014)