Ge'ez script
The Empire of Aksum is notable for a number of achievements, such as its own alphabet, the Ge'ez script, which was eventually modified to include vowels, becoming an abugida. Furthermore, in the early times of the empire, around 1700 years ago, giant obelisks to mark emperors' (and nobles') tombs (underground grave chambers) were constructed, the most famous of which is the Obelisk of Aksum.