I visited Aksum in March 2016 as part of a trip to Ethiopia. Aksum is the holiest place in Ethiopian Christianity. Every Ethiopian Coptic church has a replica of the Arc of the Covenant which is believed to reside in the city of Aksum. I was there during Lent which allowed me to view many of the processions around the church.
In addition to the holy areas, there are also several ancient obelisks dating back to the Aksum Empire of the 3rd and 4th Century.
Be warned that there is a church on the grounds which is only accessible to men.