Not ATC per se...
As a pax flying into Toronto, the pilot announced our arrival would be delayed twenty minutes due to traffic flow problems at the airport.
So, does the pilot circle around some boring crop field?
Nope. We spent twenty minutes circling directly over Niagara Falls.
I was in a window seat looking straight down at the Falls the whole while, pulling my head back occasionally to let others get a good view.
Do pilots notice when all passengers crowd to one side to look out the windows?