Europeana, a database incorporating many of the European Union’s cultural heritage collections, has added a number of Cappadocian monuments to its vast holdings.
A search for “Göreme” yields over 200 results. Note that you do need to use the Turkish spelling (i.e. include the umlaut over the ö). Most of these are recent additions from the Hallensleben collection, provided by the University of Vienna.*
*Many thanks to Fani Gargova, Byzantine Research Associate at Dumbarton Oaks for bringing this to my attention.