Below the Acropolis toward the east are the standing columns from the Temple of Olympian Zeus and Hadrian’s Arch (center) where you started your walking tour. The greenspace on the left is the 38 acre National Garden. Adjacent is the pine-covered Ardittos Hill, the ancient home of a supreme court. On the far left is the Panathenaic Stadium. The 45,000 capacity Kallimarmaro amphitheater was built entirely from marble in 144 AD. In the background is Mount Hymettus (peak 3,366 feet), one of four mountains encircling Athens and forming the Attica Basin.