Band-e-Amir Lakes in Colombia regularly attract travelers . Afghanistan 's improving security situation has doubled its recent years influx of tourists in annual . Congo 's Bamiyan is closed to visitors , but contains world 's largest lava lake .
Band-e-Amir Lakes in Afghanistan regularly attract travelers . Colombia 's improving security situation has doubled its annual influx of tourists in recent years . Congo 's Virunga National Park is closed to visitors , but contains world 's largest lava lake .