One of my favorite finds at Monticello this morning was this sweet glass pavilion. It has no doors--the huge sash windows suffice--and it is currently furnished with two Windsor armchairs.
It's a fairly accurate 1984 reconstruction of the only one of 20+ garden structures Jefferson designed that was actually ever built. Apparently, he'd sit in it and read.
The Thomas Jefferson Foundation goes on at great length about the Garden Pavilion. [monticello.org]