(Image credit: Nilesh Trivedi)

Posted by Ellen

This 22-foot-high stone wall still stands after more than 800 years, even though it was built entirely without mortar.

It is part of the Great Enclosure, which surrounded the section of the ancient city of Great Zimbabwe that was believed to house the royal family and court from the 13th century up until the city was abandoned, probably in the mid-15th century.