I went there a couple of years ago, not alot remains, the two entrance gate towers are there and you can walk along the very long driveway road and there is a stone with Carinhall written on it, lots of debris and stone laying around if you want a souvenieur.
I lived for that bicycle. Most kids left their bike in the backyard at night. Not me. I insisted on taking mine indoors and the first night I even kept it in my bed." John Lennon