Thomas Jefferson began construction on Monticello when he was 26 years old, in 1769, although the project did not finish for 40 years. Most impressive in the mansion are the little things, such as the writing desk and dumbwaiter designed by Jefferson himself, or the set of antlers hanging in the entrance hall, which were a gift from Lewis and Clark. Also available is a tour of the grounds, which show the extensive slave quarters, the outdoor kitchen, and wine cellar.