This is Clos Luce, in the town of Amboise. This was the home of Leonardo da Vinci for the last 3 or 4 years of his life. He was sponsored by the king (whoever was king at the time); all he had to do was hang out with the king every once in a while and discuss intellectual and artsy things. There was a secret tunnel between here and the chateau at Amboise, which is where the king spent some of his time. Nowadays Clos Luce contains a museum of da Vinci's works, including an exhibit of working models of many of the gadgets he designed.
Admission price here was 37FF per person.