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The massive 23m high columns of the Temple of Jupiter stand over the ancient Roman ruins on November 10, 2010 in Baalbeck, Lebanon. Work is believed to have begun on the temples in 60BC, taking more than 120 years to finish, utilising the resources of 100,000 slaves. The columns are the largest in the world, at 22.9 metres high, and 2.2m in girth, and their foundation is made up of the largest building blocks in the world, one is more than 1000 tonnes. Photo by Jamie McDonald