A project that began in 515 BC
The sanctuary project started around 515 BC in what is now central Athens, but completion took many generations. This long start-stop history explains why the place feels both monumental and fragmentary at the same time.
Hadrian's completion in AD 131/132
Under Hadrian, the temple reached its final imperial form in AD 131/132, with 104 columns in total. That scale made it one of the largest temple projects of its era in the Greek world.
Why only 15 columns stand now
By around the 5th century AD, decline and material reuse had already reduced the monument. A further dramatic moment came in 1852, when one column collapsed in a storm. What remains is still powerful, but it is the surviving frame of a much larger vision.
What to notice during your walk
As you move through Olympieion, notice how the standing columns interact with the nearby axis of Hadrian's Arch and the Acropolis skyline. For families and first-time visitors, this visual alignment is the easiest way to feel the historical scale quickly, without overloading the stop.