Is it true that the clown came out of the hospital and blew up the building in Batman 2? Where was this movie and Batman 3 filmed?

It blew up an abandoned house that was about to be demolished by blasting in the city where it was filmed, so it is true.

There are many specific shooting locations, because many scenes of the film are shot in different places. You see, there are 2 Hong Kong, the plane at the beginning of 3 was shot in Scotland ... then the prison shot was taken in Pakistan, the explosion of the football field and the main shooting of the city was taken in Pittsburgh, USA. Even the football team is a guest of Pittsburgh football team, including the mayor of Pittsburgh. ...

You can look at Baidu in detail. There are a lot of materials, so I won't type them out one by one.