Sister Buildings
Sometimes two buildings, hundreds of kilometers apart, turn out to share something: their timber was cut from the same forest region in the same few years — likely the same felling, maybe even the same shipment. These are the connections that survive by accident, in the wood itself.
Timber from Uppland, around 1470 AD
2 buildings · up to 515 km away
Glimmingehus
1472 AD · Pine
515 km from Uppland
Photo: Wikimedia Commons · CC BY 2.5

Linköpings slott
1472 AD · Pine
185 km from Uppland
Photo: This photo (C) Lars Aronsson · Wikimedia Commons · CC SA 1.0