The Ottoman sultans' palace of courtyards and treasure. Pay for the Harem.
Topkapi Palace was the seat of the Ottoman sultans for four centuries, a sprawl of courtyards, tiled pavilions and jaw-dropping treasury over the Bosphorus. It ran an empire from here.
Yes, and pay for the Harem; go at opening to beat the crowds.
It's a ticketed sight — book online in advance to skip the queue.
Arrive at opening or you'll queue and shuffle; buy the separate Harem ticket, because the tiled private quarters are the best part and most people skip them.