These are the 3 cards I picked from this travelling envelope, dedicated to churches. The cards are from Austria and Germany.
Salzburg Cathedral is the 17th-century Baroque cathedral of the Roman Catholic Archdiocese of Salzburg in the city of Salzburg, Austria, dedicated to Saint Rupert and Saint Vergilius. Founded by Saint Rupert in 774 on the remnants of a Roman town, the cathedral was rebuilt in 1181 after a fire. In the seventeenth century, the cathedral was completely rebuilt in the Baroque style under Prince-Bishop Wolf Dietrich Raitenau to its present appearance.
Salzburg Cathedral still contains the baptismal font in which composer Wolfgang Amadeus Mozart was baptized. - in: wikipedia
I didn't find much about this church. I only know it is located in Zickhusen, in the state of Mecklenburg-Vorpommern, in northern Germany. It's a constrution from 1827.