It takes place in the complex of the Trajan's Forum planned by the famous architect Apollodoro from Damask. In the plinth, inside the sepulchral room, the emperor's ashes were placed in a gold urn but the precious sepulchral room was sacked during Middle Ages.
The Dacians' weapons are represented in the plinth. Along the whole column, with a spiral course about 200 meters long, bas-relief friezes tell scenes of war and Trajan's life.On the top there was once a Trajan's statue which unfortunately got lost and was replaced by a ST. Peter's statue of the 16th century. A very small door is the entrance to the emperor grave and also to a spiral staircase which gets to the top.