This is one photograph where I was glad to have my wide-angle (10mm) lens on hand. This is the world's largest hot spring - up to 200m wide - located in New Zealand's Waimangu Thermal Valley. It was formed following a volcanic eruption in 1886.
(March 6, 2014. Nikon D5000, 1/100s @ f/7.1, 10mm, ISO 200.)