In September 2016 I was back in Rabaul and this photo shows it as it was then (it had erupted since 1994 but not as badly) .. you can see the hot springs that are almost boiling. You can also see that the volcano itself, is not that high from ground level, but I guess there is a lot more of it under the ground. People can walk up to the rim and back again, I didn't do it on this volcano as apparently the ash is very slippery .