You’ve probably seen lots of tourist photos over the years of the 1960s Monument to the Discoveries in Lisbon – the white one with all the people looking out to sea, commemorating the former Portuguese empire. But you might not have seen the view of the ground from the top.

The 50-metre wide mosaic on the floor (a gift from South Africa) shows Portugal’s former trading routes across the world, reminding visitors that this was once the centre of a global empire. Take a look at the black-and-white limestone pattern, too. This motif is typical across Portugal, and you’ll also find it on the beach fronts in Macao, Mozambique and Rio.