Oriol Alamany / Petroglyph of an Elephant at Khaz'ali Canyon, Wadi Rum Protected Area, Jordan, April 2009

Oriol Alamany / Silhouette of Moai statue at dawn in Ahu Ko Te Riku, restored archaeological site of Ahu Tahai, Hanga Roa, Easter Island, Pacific ocean, November 2004

Oriol Alamany / Moai stone statue at dusk on the slopes of the quarry at Rano Raraku volcano, Easter Island Pacific ocean, November 2004

Jeff Vanuga / Native American Teepee rings on Table Mountain near Dubois, Shoshone reserve, Wyoming, USA, May 2009

Christophe Courteau / Megalith site Dolmen of La Roche aux Fées at night, Brittany, France.

Roger Powell / Part of the Summit monastery showing 6th century beehive cells. now occupied by large numbers of Storm Petrels, Co Kerry, Republic of Ireland, June 2011

Nick Upton / Aerial view of Domestic sheep (Ovis aries) grazing on Horsford Castle Hill, the remains of an 11th century Mott and Bailey fortress, now grassed over to become pastureland, Near Norwich, Norfolk, UK,...

Tim Laman / Human skulls and other bones on the floor of a cave in Triton Bay. Note skull with a large hole in it from possible battle wound. Raja Ampat, West Papua, Indonesia, April 2007

Angelo Gandolfi / Interior of medieval cave dwellings, carved out of tufa rock, at the Vitozza troglodyte settlement Tuscany, Italy. April 2009

Angelo Gandolfi / Medieval cave dwellings, carved out of tufa rock, at the Vitozza troglodyte settlement Tuscany, Italy. April 2009

Angelo Gandolfi / A medieval cave dwelling, carved out of tufa rock, at the Vitozza troglodyte settlement Tuscany, Italy. April 2009

Tim Laman / Stone walls and other features at a ancient Polynesian archaelogical site in Hatiheu Valley, Nuku Hiva, Marquesas Islands, French Polynesia, July 2006