Yellow rendering on stonework conservation project, Orford Castle, Suffolk, England, United Kingdom, Europe

Close up of buttress roots of banyan tree, Polonnaruwa ancient city, North Central Province, Sri Lanka, Asia

Old gold mine buildings, Rodalquilar, Cabo de Gata natural park, Almeria, Spain, Europe

The Roman period water storage cistern building, Apollonia Archaeological Park, Pojan, Albania, Europe

Detail of the Parthenon, a former temple dedicated to the goddess Athena, located on the Acropolis, UNESCO World Heritage Site, Athens, Greece, Europe

Isola Rossa historic tower at sunse, Sardinia, Italy, Mediterranean, Europe

Stone wall of Sacsayhuaman above Cusco in Peru, South America

Stone walls of Sacsayhuaman above Cusco in Peru, South America

Dry-stone walls of Machu Picchu ruins of Inca citadel in Peru, South America

Machu Picchu ruins of Inca citadel in Peru, South America

Dry-stone walls of Machu Picchu ruins of Inca citadel in Peru, South America

View of The Urubamba Valley from Machu Picchu ruins of Inca citadel in Peru, South America