Facade of the old abandoned railway Tunnel La Engana, between Burgos province and Cantabria, Spain.
RFHY63YMFacade of the old abandoned railway Tunnel La Engana, between Burgos province and Cantabria, Spain.
Entrance to San Cristobal Mine, an old Abandoned Mercury Mine, in Almaden Quicksilver County Park
RF2BBG12AEntrance to San Cristobal Mine, an old Abandoned Mercury Mine, in Almaden Quicksilver County Park
facade from Qiding Twin Tunnels in miaoli county, taiwan
RF2D9PJA4facade from Qiding Twin Tunnels in miaoli county, taiwan
Entrance to San Cristobal Mine, an old Abandoned Mercury Mine, in Almaden Quicksilver County Park
RF2BBG127Entrance to San Cristobal Mine, an old Abandoned Mercury Mine, in Almaden Quicksilver County Park
facade from Qiding Twin Tunnels in miaoli county, taiwan
RF2D9PJCRfacade from Qiding Twin Tunnels in miaoli county, taiwan