Images

A section of the Great Enclosure of Great Zimbabwe, Zimbabwe. Built in the 13-14th century CE using granite, the wall is 5.5 metres (18 ft.) thick in places and 9.7 metres (32 ft.) high.

The conical tower of the Great Enclosure of Great Zimbabwe, Zimbabwe. Built in the 13-14th century CE using granite, the purpose of the structure is not known.

Statue of Julia Soaemias Bassiana (180 – March 11, 222 CE), a Syrian noblewoman and the mother of Roman emperor Elagabalus who ruled over the Roman Empire during her son's reign (218 to 222 CE). The statue was found in Perge and is now in...

View of Great Zimbabwe's 'Great Enclosure'. This is the largest collection of ruins in southern Africa. The Gokomere Empire flourished here from the 11th Century CE to its collapse in the early 15th century CE.

A modern camel caravan in Morocco.

A map of West Africa from the 1375 CE Catalan Atlas. The map shows the trans-Saharan caravan trade routes between North Africa and the Niger River. (Sheet 6, National Library of France, Paris)

Ten Caesars: Roman Emperors from Augustus to Constantine

Built in the 16th–18th centuries, the Salzspeicher (salt storehouses) of Lübeck, Germany, stored salt to be shipped to the Baltic region.

Arms of the Hanseatic League, 1670 CE, Museum of London

Boats transporting slabs of rock salt on the Niger River delta, Mopti, Mali. The salt comes from ancient mines in the Sahara desert.