Swiss authorities on Monday returned 18 Benin Bronzes to Nigeria in a ceremony at the National Museum in Lagos, the latest addition to the nation’s growing collection of repatriated treasures.Countries across Africa have been pushing in recent years for the restitution of artefacts and artworks taken during the colonial period – including Nigeria’s famed Benin Bronzes, which were looted as spoils of war by the British and today are scattered in museums and private collections across the...