Museum Passes in Turkey allow a single entrance to multiple attractions within a certain region. There are Museum Passes for Istanbul, Cappadocia, the Aegean and the Mediterranean. And then there is a comprehensive Turkey Museum Pass.
Istanbul Museum Pass is valid for 5 days and costs 125 TL (Turkish liras)
Cappadocia Museum Pass is valid for 72 hour and costs 75 TL
The Aegean Museum Pass is valid for 7 days and costs 75 TL
The Mediterranean Museum Pass is valid for 7 days and costs 60 TL
Turkey Museum Pass is valid for 15 days and costs 210 TL
So, if you a planning a longer trip to Cappadocia or other regions of Turkey, it makes sense to purchase such a pass on the first day. This way you will avoid the lines at the ticket office. The passes are usually available at any attraction included in the national museum network.