Pyramid of the Sun, Teotihuacan, modern-day Mexico
Pyramid of the Sun, Teotihuacan, modern-day Mexico
15th century AD house of a Christian monk, Suceava, Romania
15th century AD house of a Christian monk, Suceava, Romania
Megalithic structures on the Spanish island of Minorca
Megalithic structures on the Spanish island of Minorca
Ancient underground refuge, Shanxi Province, China
Ancient underground refuge, Shanxi Province, China
