They’re building a castle using middle-aged techniques!
In rural France, the Guédelon project has been underway since 1997 and is projected to be completed in the 2020s. Part tourist attraction, part 13th century construction lab, Guédelon is definitely a sight to behold.
To build the castle, workers use only local materials, split and carve stone themselves, build wooden support structures and horse-drawn carts and hamster wheels. They also make ropes and forge every nail and tool that is used on the site. They even mix their own mortar with sand and limestone.
Visiting Guédelon (I’ve done so twice now) is an incredible learning experience not only for researchers and workers but also the visiting public!