[rosybox]

Just listening to the balloon pop in the Hagia Sophia was amazing to hear. Are there any other structures with similar acoustics that still holds performances?

Also there's a YouTube playlist of the recording they mention at the end, the Lost Voices of Hagia Sophia:

https://www.youtube.com/watch?v=-VrJ8XOwJzw&list=OLAK5uy_k98...

[elorant]

I don't know if it qualifies as a structure since it's open, but the ancient theatre of Epidaurus is renowned for its acoustics and is still operational to this day.

https://en.wikipedia.org/wiki/Ancient_Theatre_of_Epidaurus