You need to sign up for that tour in advance.
There is a museum and a walking tour around the grounds.
A separate museum and tour are at the Cafe across the street.
A few nearby places worth checking next.
I have been using it now for 3 months and it saves me so much research. Reduces the need to call and double check every time.
How did I not know these places existed?! Atly's scoring is a lifesaver, now I can finally find THE spot without wasting time Googling my life away.