In February NPR ran an audio story titled "The Lost Voices
of Hagia Sophia."
You get a sense for what it was like praying in the 6th century
in one of the world's largest Catholic churches.
The story is worth a listen at
https://www.npr.org/2020/02/22/808404928/listen-the-sound-of-the-hagia-sophia-more-than-500-years-ago
Listen with good speakers or headphones. You'll get chills.
Richard the Lionheart at
Mass in Hagia Sophia
by Gaspare Fossati (1849)
by Gaspare Fossati (1849)