I reached five of the villages to visit the fortified churches :

Calnic - by taxi from Sebes station

Prejmer - by train to Ilieni, returning by bus direct to Brasov

Saschiz, Viscri and Biertan - by taxi from Sighisoara

Of the five I found Viscri to be the most interesting and attractive, although I also liked the bottle glass windows of the Biertan church.