Only watched it because of the location.

I did not really expect a great movie and it was even quite worse than I expected (especially because I had to watch a dubbed version), but I was really only interested in this movie because of the location. Don't ask me why but there's something about these disaster movies involving iconic buildings or locations that immediately makes the whole premise more appealing.

Maybe a stupid question but besides the exterior shots, did they do any filming in the actual TV tower or did they rebuild the restaurant and viewing area completely on location?