Check out the SALT MINE and the MOSAIC MUSEUM as well as some churches with unique interiors.
There was some subtle music/sound in this salt mine as well as this visual treat. Walking through the space was actually spiritual and calming.
The mosaic museum had well laid out mosaics and a few replicas. Really well done displays.
Some interesting interior spaces in Turkey
From inside a dark temple you can see this Turkish tourist in a conversation and then taking a selfie