On 21 November 1973, this USN C-117D had to land on a frozen river in a lava field in Southeastern Iceland. The aircraft was operating out of Keflavik at the time. Everybody survived the incident, but the aircraft was lost. Most of the remains were left on the site. You can still walk there if you want (takes a couple of hours back and forth), but they now also operate a bus that brings you there. For birdwatchers: the area is a famous breeding ground for the great skua (do not approach their nests: they will attack you!).