There were seven wonders of the world in antiquity, and UNESCO counts 1,121 treasures today. A good half of them are threatened by natural disasters, war, urbanization or decay.
                                        
                                      In Planet of Treasures, historian Sir Christopher Clark presents these most fascinating places around the globe: his path leads from the Great Pyramid of Giza in Egypt to the Serengeti National Park in ...
                            
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