Pompey's Pillar
Also known as Diocletian's victory column, this 26-meter tall monument is located at the Serapeum in Alexandria. Following the Roman invasion of Egypt, Alexandria proved to be a difficult city to conquer. Realizing that Alexandria was crucial to Roman trade and that sacking and pillaging would not be a prudent method of attack, Diocletian sieged the city. When he finally succeeded in taking the city in 298 CE after a full half-year of waiting, he constructed the column as a remembrance of his victory.
Pompey may have had a pillar somewhere, but unfortunately this one wasn't his.
