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Istanbul
Istanbul straddles two continents and runs the densest urban transit network in the eastern Mediterranean — Marmaray under the Bosphorus, the M11 metro out to the new airport, and the historic tram up to Sultanahmet. Stay in Karaköy, Beyoğlu or the Sultanahmet conservation zone to walk the Hagia Sophia, Topkapı and the Grand Bazaar end-to-end. Several boutique hotels in the historic peninsula carry the Green Star certification.
Highlights: Hagia Sophia & Blue Mosque · Topkapı Palace & Basilica Cistern · Bosphorus ferry to Anadolu Kavağı · Grand Bazaar & Spice Bazaar