Owlery

The Owlery is a windowless, circular stone room , located in the West Tower of Hogwarts. Due to the room having no windows, owls are free to fly in and out easily. Students use the owls to send messages to others. It was used a lot during Harry's time at Hogwarts.

In 2021, Albus and Scorpius used the room to blow up a Time-Turner , wich they failed in doing. (If you believe The Cursed Child counts as canon.)