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Ctesiphon (Al-Mada'in), the city dates from the 2nd century BC, 20 mile south of Baghdad, Iraq, Middle East

Cooling towers, Radcliffe on Soar Power Station, domestic housing in foreground, Trent Valley, Nottinghamshire, England, UK, Europe

Morning Glory Pool, a geothermal pool, colours are due to algae at temperature bands, hotter below, Yellowstone National Park, Wyoming, USA

Gorely volcano, tundra plants on slopes, summit crater rims on skyline, Kamchatka, East Siberia, Russia

Koryaksky volcano, andesitic cone seen from shoulder of Avacha volcano, Kamchatka, East Siberia, Russia