Savasana!
Pigeon pose is fantastic... it allowed me to live a semi-normal life. It was my nemesis for the first couple of years, but it was the only thing that worked for a nerve issue I had when I was younger. So with that in mind, I would have to say Eka Pada Rajakapotasana (One-Legged King Pigeon Pose) is one of my favourites now because it shows how far a body can be pushed to overcome adversity.
Also, handstands, just because it's fun being upside down. 🙃