The Arch of Labná
How did Puuc Maya masons throw a six-metre-high span of thin veneer stone over open air without ever cutting a keystone — and what was a monumental gateway doing in the middle of a city of only about three thousand people?
c. 800-1000 CE (Terminal Classic); the arch is usually placed in the later 9th century, and Labná's only readable dated inscription reads 862 CE · Labná, Yucatán, MexicoAdded July 2026