Also still standing is the curved end of the Hippodrome, called the Sphenodone. It’s basically a support structure made up of 25 vaulted chambers and a corridor that led to the stone bleachers. Great building material, these bleachers were disassembled over the years and used to contruct other things like the Blue Mosque’s courtyard, which sits where the Emperor’s royal viewing platform (called the “Kathisma”) once stood.