There's something spooky yet gripping about exploring crypts and vaults. If this sounds interesting to you, stop by Tombs of Süleyman and Roxelana.
You'll want to arrive nice and early to fully appreciate Tombs of Süleyman and Roxelana. Remember to bring some cash too — this tomb site has an entrance fee. Intend to hang around the commercial neighborhood of Sirkeci a while? Pay a visit to Blue Mosque, Hagia Sophia and Topkapi Palace while you're exploring this area.