The Parthenon was never meant to have a straight line. Every column swells, every step curves, every wall leans inward. These optical refinements were calculated to the millimetre, correcting for the odd way human eyes perceive space. The result is a building that looks perfectly straight when nothing about it is.

Built in 15 years using 16,500 blocks of Pentelic marble, it housed a 42-foot statue of Athena carrying 1.2 tons of gold. Yet here's the puzzle: it had no altar. The city's main festival used the Erechtheion next door instead. Was it a temple or a treasury? Scholars still debate. Perhaps it was simply Athens' loudest power statement.

On September 16th, 1687, a Venetian cannonball hit Ottoman gunpowder stored inside, and the building exploded.

VoiceMap's self-guided audio tours trace its transformations from pagan temple to Christian cathedral to mosque, explaining how optical mathematics and wartime explosions shaped what remains today.