Ireland, County Offaly, Clonmacnoise monastery, South Cross preserved in controlled atmospheric conditions.

Greece, Aegean Islands, Cyclades, Naxos. Ruins of temple and the Portara Gateway, marble doorway framing view of white painted Naxos Town below.

Turkey, Istanbul, Sultanahmet, stone column in Topkapi Palace Gardens.

Mexico, Oaxaca, Monte Alban archaeological site, Ruins of Monticulo J and Edifio I,H and G buildings in the central plaza.

Mexico, Oaxaca, Monte Alban, Edificio buildings G, H and I in the central plaza.

Mexico, Oaxaca, Monte Alban, Ruins of Los Danzantes and Monticulo buildings and central plaza.

Mexico, Oaxaca, Monte Alban, Site view onto ball court or Juegos de Pelota.

Mexico, Oaxaca, Mitla archaeological site, Detail of stone geometric mosaics on the Templo de las Columnas.

Mexico, Veracruz, Papantla, El Tajin archaeological site, Archaeologists at work at Tajin Chico with Pyramide de lo Nichos beyond.

Mexico, Veracruz, Papantla, El Tajin archaeological site, Pyramide de los Nichos with tourist couple in middle foreground.

Mexico, Veracruz, Papantla, El Tajin archaeological site, Pyramide de los Nichos.

Belize, Altun Ha, The Temple of Masonry Altars in Plaza B of the Mayan ruins, A large carved jade head of the Mayan sun god Kinich Ahau was found in the temple, Tourists climbing stairway and atop the...