Images

A great kiva at Chetro Ketl, an immense great house at Chaco Canyon, New Mexico, USA. Constructed from the 11th to the 12th century CE.

The back wall of Chetro Ketl, an immense great house at Chaco Canyon, New Mexico, USA. Constructed from the 11th to the 12th century CE.

Equinoctial sunrise at Casa Rinconada, the largest excavated great kiva at Chaco Canyon, New Mexico, USA. Constructed from the 11th to the 12th century CE.

A landform with an ancient astronomical observatory at the top at the eastern entrance to Chaco Canyon, New Mexico, USA.

The pictograph of a star potentially depicts a supernova event and is located at Chaco Canyon, New Mexico, USA. Created c. 1054 CE.

A tri-walled structure outside Pueblo del Arroyo, a great house next to Chaco Wash at Chaco Canyon, New Mexico, USA. Constructed from the 11th to the 12th century CE.

A great house built using a late masonry style at Chaco Canyon, New Mexico, USA. Constructed during the 12th century CE.

The Byzantine Church of the Holy Apostles, Athens. Built c. 1000, it is typical of the Byzantine church model copied everywhere across the Byzantine Empire.

The interior of the Hagia Sophia, Istanbul. It was built in 532-537 CE during the reign of Justinian I on the site of two more modest versions dating back to the 4th century CE.

A diagram of one of the finest surviving Byzantine basilicas, the Church of Saint Irene in Istanbul (mid-6th century CE and remodelled in the 8th century CE).