Transylvanians of the 15th century, Saxon Germans, fortified
their churches. This was clearly easier than building a city
wall. Here is the Valea Villor Fortified Catholic Church,
which dates back to 1263, a World Heritage Site still
surrounded by a single gigantic wall.
An interior view of the wall, which on the far left now is
being used for cultivating grapes.
The Biertan Fortified Church, also 15th century, was
protected by three separate walls, each layer visible in this
picture. Biertan boasts of never falling to any attacker,
including an Ottoman Empire army, whose siege failed.
Here is Biertan's alter. The church is now Lutheran and still
holds services. It's another World Heritage Site.