Sphendone-Parking Lot Arch. Hippodrome, Sultanahmet, Istanbul 2007. Wednesdays there's a farmers' market bazaar in this parking lot, other days you can simply park your car in front of mystery structures built onto the wall to fulfill some purpose now forgotten. The History Channel went behind these arches in a canoe. The entire Hippodrome substructure is floored with water, like a ship with an ocean inside.