This is a view of Rabaul I took from the Volcanological Observatory, where volcanologists monitor the 14 active and 23 dormant volcanoes in PNG. It is a great view even on a windy day – I had trouble standing up!!
The harbour is actually a dormant caldera and Rabaul is the only town in the world built on one!
To the left is the active Mt Tavurvur (it was puffing quietly yesterday) and on the right is Vulcan which is now dormant. The area on the left of this photo was where the brunt of the ash fell in the dual eruptions of Vulcan and Tavurvur in 1994 – (the buildings collapsed under the weight of it).
This link is excellent and gives photos before and just after the eruptions. The map at the bottom of the link is good. The cross marks the position of the observatory.