Mexico, Anahuac, Teotihuacan, Pyramid de la Luna.

Mexico, Anahuac, Teotihuacan, Pyramid de la Luna and Plaza de la Luna with tourist visitors.

Mexico, Anahuac, Teotihuacan, Pyramid del Sol detail with Pyramid de la Luna beyond.

Mexico, Anahuac, Teotihuacan, Pyramid de la Luna.

Mexico, Anahuac, Teotihuacan, Pyramid del Sol or Pyramid of the Sun and surrounding landscape.

China, Tibet, View of the Kings Palace hilltop ruins.

Italy, Lazio, Rome, The ruins of Trajan's forum & markets and the Ulpia Basilica.

Ireland, County Roscommon, Boyle, Lough Key forest park, church ruin and autumnal trees.

France, Brittany, St Mathieu lighthouse and ruined Abbey at Pointe de St Mathieu at the mouth of the Gulf of Brest near Le Conquet.

Nepal, Upper Mustang, The ruins of the ancient King's Ame Pal fortress, Rani's Fort in front of Ketcher Dzong, at the top of the mountain.

Nepal, Upper Mustang, The ruins of the ancient King's Ame Pal fortress, Rani's Fort in front of Ketcher Dzong, at the top of the mountain.

Mexico, Quintana Roo, Tulum, Temple of the Wind.