The Pergamon Altar was a monument built during the reign of the Ancient Greek King Eumenes II of the Pergamon Empire in the 2nd century BC.
The altar was dedicated to Zeus and Athena. It was recognized as one of the Seven Wonders of the Ancient World.
The base features a high-relief frieze depicting the Gigantomachy, the battle between the Olympian gods and the Giants.
The altar was built on one of the terraces of the acropolis of Pergamon in Asia Minor (now a territory of Turkey).
Germany made a purchase with the Ottoman Empire (the empire before the Republic of Turkey) and excavated it in 1878, and later moved it to Berlin.
The structure is massive, measuring approximately 35.74 meters (approx. 117 feet) wide, and 33.4 meters (109.5 feet) deep, with a front stairway nearly 20 meters (66 feet) wide.