A picture taken on June 27, 2017 shows an abandoned house filled with sand, in the deserted mining town of Kolmanskop, in Luderitz, Namibia. The geological forces of the desert mean that tourists now walk through houses knee-deep in sand. Kolmanskop is popular with photographers for its settings of the desert sands' reclaiming this once-thriving town. / AFP PHOTO / GIANLUIGI GUERCIA (Photo credit should read GIANLUIGI GUERCIA/AFP via Getty Images)
A picture taken on June 27, 2017 shows an abandoned house filled with sand, in the deserted mining town of Kolmanskop, in Luderitz, Namibia. The geological forces of the desert mean that tourists now walk through houses knee-deep in sand. Kolmanskop is popular with photographers for its settings of the desert sands' reclaiming this once-thriving town. / AFP PHOTO / GIANLUIGI GUERCIA (Photo credit should read GIANLUIGI GUERCIA/AFP via Getty Images)
A tourist walks in an abandoned house filled with sand, in the deserted mining town of Kolmanskop, near Luderitz, Namibia, on June 27, 2017. For the past decade, growth in tourist numbers has been modest but consistent. In 2015, nearly 1.4 million foreigners visited Namibia. The steady increase has already made tourism the country's third largest sector, bringing in more than 15 billion Namibian dollars (USD 1.2 billion, 1 billion euros) annually -- 20 percent of the country's GDP -- behind only mining and fishing. / AFP PHOTO / GIANLUIGI GUERCIA (Photo credit should read GIANLUIGI GUERCIA/AFP via Getty Images)
A picture taken on June 27, 2017 shows an abandoned house filled with sand, in the deserted mining town of Kolmanskop, in Luderitz, Namibia. The geological forces of the desert mean that tourists now walk through houses knee-deep in sand. Kolmanskop is popular with photographers for its settings of the desert sands' reclaiming this once-thriving town. / AFP PHOTO / GIANLUIGI GUERCIA (Photo credit should read GIANLUIGI GUERCIA/AFP via Getty Images)
