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

Restoration of Notre Dame Cathedral, Paris, France

Restoration of Notre Dame Cathedral, Paris, France

Restoration of Notre Dame Cathedral, Paris, France

Restoration of Notre Dame Cathedral, Paris, France

Old mudbrick village under reconstruction, in the Old town of AlUla, Medina Province, Saudi Arabia

Aerial view of the Old mudbrick village under reconstruction, in the Old town of AlUla, Medina Province, Saudi Arabia

Old mudbrick village under reconstruction with new neighborhoods in the background, in the Old town of AlUla, Medina Province, Saudi Arabia

The Global Seed Vault just outside the town of Longyearbyen on the island of Spitsbergen in Svalbard, Norway, Arctic, Europe

Archaeologists at work, Chichen Itza, UNESCO World Heritage Site, Yucatan, Mexico, North America

Minaret supported by steel cables, a project undertaken by UNESCO and local experts in 2003, The Mousallah Complex, Herat, Herat Province, Afghanistan, Asia

Minaret supported by steel cables to prevent it from collapse, a project undertaken by UNESCO and local experts in 2003, The Mousallah Complex, Herat, Herat Province, Afghanistan, Asia