Turkey's sightseeing operates at the intersection of empires. The Hagia Sophia — built in 537, church for 916 years, mosque for 482, museum, and mosque again — is a single building that carries more historical weight than most countries. The Topkapi Palace treasury and harem require separate timed tickets and reward two visits. The grand bazaar, the spice market, and the archaeology museum form the historic peninsula circuit. Cappadocia's rock-cut Byzantine churches, the ancient city of Ephesus, the Lycian coast, and the whirling dervish ceremony of Konya extend the sightseeing into completely different registers across a country of continental size. Blink and you'll miss it.