Jack Dykinga / Roots of Fig trees (Ficus sp) growing in the collapsed Cenote Oxpeejool (sink hole), near Tekax, Yucatan, Mexico. Afternoon light illuminates the elongated cavern on the right. October 2009

Ernie Janes / Collapsed rock from cliff, coastal erosion, Happisburgh, Norfolk, UK, May

Nick Upton / White limestone cliffs with sections that have collapsed into the sea. "Le Grain de Sable" (grain of sand) sea stack is central. Bonifacio, southern tip of Corsica, France, May 2010.

Nick Upton / White limestone cliffs with sections that have collapsed into the sea. "Le Grain de Sable" (grain of sand) sea stack is to the right. Bonifacio, southern tip of Corsica, France, May 2010.

Steven David Miller / Collapsed limestone tunnel, within Tunnel Creek National Park, The Kimberley, Western Australia

Dave Bevan / A collapsed pingo at East Wretham heath nature reserve Breckland, Norfolk, England, UK

Patricio Robles Gil / Bull collapsed on the ground in bullfight with matador watching, Plaza de Toros, Mexico City, Mexico

Guy Edwardes / Looking up at the sky through the twin openings in a collapsed cave ceiling, Zelske Jame, Skocjan Karst Gorge, Rakov Skocjan, Slovenia, Europe, October 2007

Igor Shpilenok / Aerial view of the Ranger stations after the landslide of June 3, 2007, which changed the face of the Valley of the Geysers, Kronotsky Zapovednik, Kamchatka, Far East Russia During the landslide of J...

Pete Oxford / Tourists with mountain bikes at 'Los Gemelos' / The Twins, two 'pit-craters', Highlands, Santa Cruz Is, Galapagos. Empty magma chambers that collapsed in on themselves due to the weight of overlying...

Jane Burton / Collapsed dog covered with an emergency blanket of heat reflecting foil

Igor Shpilenok / A large thermal lake in the collapsed Golovnino Volcano, Kurilsky Zapovednik, Russia.

Nick Upton / Collapsed school buildings after earthquake, Taiwan

Paul D Stewart / Copperplate engraving of mythical hydra with hand colouring by J. Chapman 1806 after engraving by Seba in his 'Treasury of Natural History' (1734). In 1735 a young Linnaeus visited Hamburg. While ther...

Rick Tomlinson / "Atlantic Privateer" during the Whitbread Round the World Race, 1985. ^^^ She was dismasted on leg 1 after beating into a gale for days, the jury rig also collapsed and the boat was forced to retir...