You will probably all know, or at least have heard of, the project in Guedelon, where a medieval castle is being re-built using materials and methods available in the 13th century.

Guedelon does seem to be a success, at least in terms of being well-known and visited. And now something similar-but-different is planned in Germany, called "Karolingische Klosterstadt" (Carolingian monastic city).

The project is to re-build the famous plan of St. Gallen, the idealistic layout and plan for a monastery. There's an official project website that does not offer very much yet, but there's one English pdf presenting the project idea - and some very interesting thoughts about how interpreters should be trained.