Robert talks to George Hedges, who has just returned from a trek across the southern Arabian peninsula -- following the route described by the likes of Pliny (PLIH-nee) the Elder and Ptolemy (TAWL-uh-mee), along which frankincense was traded. With the help of contemporary LANDSAT photographs, Hedges says his party discovered forts and trading centers along the ancient route, and a huge megalith that resembles Stonehenge. This is the first time archaeologists have studied this part of the world.
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