Topkapı Palace
Walk the four courtyards from which sultans governed three continents for nearly four hundred years.
Enough context, no spoilers
Why it matters
Mehmed II began building in 1459, six years after the conquest, on the promontory where the Bosphorus, the Golden Horn and the Sea of Marmara meet. Known simply as the New Palace, it was the Ottoman court's administrative and residential heart until Abdülmecid I moved to Dolmabahçe in 1856. The Harem alone held more than 400 rooms under the authority of the valide sultan. It opened as a museum in 1924.
What to know before you go
This needs half a day, not an hour, and the single most common mistake is buying the basic ticket. Take the combined one covering the palace, the Harem and Hagia Irene: the Harem is a separate circuit and it is the best part of the visit. Work outward — the Second Courtyard kitchens and Imperial Council chamber, then the Harem while you still have energy, then the Third Courtyard Treasury and Sacred Relics, finishing on the Fourth Courtyard terraces looking down the Bosphorus. Gülhane Park and the Archaeology Museums sit immediately below the palace walls and make a natural continuation.