Mauna Loa (4169m) from Mauna Kea, Hawaii (1989).

Piton de la Fournaise, La Réunion, 1998 (photo © Marco Fulle).

Mauna Kea (4205m) from Mauna Loa, Hawaii (1989). On its summit there are some great astronomical observatories.

Kollóttadyngja volcano, north central Iceland.