The term 'LITERALLY, 'highest city'' can be solved by the crossword solution 'ACROPOLIS' which is a nine letter word. The ACROPOLIS is an ancient citadel located on a high rocky outcrop above the city of Athens in Greece. It was built in the 5th century BC and is one of the most important archaeological sites in the world. It is home to many ancient monuments, including the Parthenon, the Propylaea, and the Erechtheion.