I visited Sümela Monastery in fall 2024. It is possible to reach it via tour from Trabzon, although you can also drive yourself, if you prefer. The walk inside involves a lot of steep stairs up and down -- keep that in mind when choosing your shoes! You can also explore a lot of the rooms, which involves ducking and squeezing into various corners of the monastery. Unfortunately, a lot of the wall art is vandalized and you can find a lot of graffiti where ever you go on the site. There are not any plaques explaining what you see in depth, only some sparse signs that say what each room would have been used for. However, I think with the addition of signs that explain the historical context, the site would be greatly improved. The price for foreigners is steep. I remember paying around $20!