Topkapi Palace

Topkapi Palace is what empire looks like when it stays home: the working seat of the Ottoman sultans for almost four centuries — not one grand building but a walled city of courtyards, kiosks and pavilions on the promontory where the Bosphorus, the Golden Horn and the Marmara meet, laid out less like Versailles than like a nomad camp fossilised in marble. Twenty-five sultans ran a three-continent empire from these gardens; what survives is the densest concentration of Ottoman art, politics and gossip anywhere, with the best sea views in the old city thrown in.

The palace unfolds in four courtyards of escalating privacy. The second is the business end — the Imperial Council chamber where viziers governed (the sultan eavesdropping through a grille above), the palace kitchens with their fleet of chimneys and a celadon collection the size of a museum. The third holds the Audience Chamber, the exquisite Library of Ahmed III, and the two heavyweight collections: the Imperial Treasury (the 86-carat Spoonmaker's Diamond, the emerald-crusted Topkapi Dagger of caper-film fame) and the Sacred Relics — the Prophet's mantle and sword, displayed to continuous Quran recitation, a room that stops even the checklist tourists. The fourth is all terraces and tulip gardens, where sultans watched their fleet come home. The Harem is the ticket worth adding: not the fantasy but the family quarters — 300 rooms of the empire's most beautiful tilework, run by the Queen Mother, where princes grew up in the gilded cage and several never left.

Practical craft: it is closed Tuesdays, it is enormous, and it is the old city's longest ticket queue after Hagia Sophia — the skip-the-line products with audio guide solve both the wait and the near-total absence of labels. Go at 9 AM sharp or after 2 PM, do Harem first while you're fresh, Treasury before the groups land, and give it three to four hours. The combination with Hagia Sophia in one day is possible but punishing; better to give Topkapi its own morning and drift downhill to Gülhane Park when your feet file a complaint.