The Ottoman and Byzantine empires shaped more of the European city landscape than most travellers realise. Constantinople (now Istanbul) was the capital of both in succession, and the layers of those empires extend across the Balkans, Greece, and parts of Central Europe in ways that reward direct engagement rather than history-book summaries. These cities have the most significant and accessible Ottoman and Byzantine heritage in Europe.

The Cities

Istanbul

Istanbul is the unavoidable answer and earns its position without any caveats. The city was the capital of the Byzantine Empire for over a thousand years and the Ottoman Empire for nearly five centuries, and the evidence of both is still standing. Hagia Sophia (Ayasofya) is the most significant Byzantine building in existence: consecrated as a church in 537 AD, converted to a mosque under the Ottomans in 1453, reconsecrated as a mosque in 2020, and open to visitors throughout. Topkapi Palace is the operational heart of the Ottoman Empire for four centuries, with kitchens, throne rooms, the Imperial Treasury, and the Harem. The Byzantine city walls along the western edge of the old city stretch for 7 kilometres and are still largely intact. The layering in Istanbul is not metaphorical: you can walk from Byzantine mosaics to Ottoman tilework to 20th-century secular buildings within a single city block.

Best for: travellers who want the primary source material for both Byzantine and Ottoman history in a single city that is architecturally extraordinary.

Athens

Athens predates Byzantium by over a millennium, but the Byzantine and Ottoman layers are genuinely present in the Monastiraki and Plaka areas if you look for them. The Tzistarakis Mosque on Monastiraki Square (1759) is now a ceramics museum but retains its architectural identity. The Fethiye Mosque inside the Roman Agora is one of the oldest surviving Ottoman structures in Athens. Byzantine church architecture is scattered throughout the city: the Kapnikarea Church (11th century) sits in the middle of Ermou Street, embedded in the shopping district. The Acropolis predates all of this but the hill itself was used as a citadel under both Byzantine and Ottoman rule, and the traces are there.

Best for: travellers combining the more famous classical Athens visit with an interest in the less-visited Byzantine and Ottoman layers of the city.

Thessaloniki

Thessaloniki has the most outstanding concentration of Byzantine architecture outside Istanbul. The city has 15 UNESCO-listed Byzantine monuments, including the Rotunda (built by Galerius in 306 AD and converted successively to a church and mosque), the Acheiropoietos Basilica, and Hagia Sophia of Thessaloniki (pre-dating its more famous namesake in Istanbul). The Ottoman layer is also substantial: the Bey Hamam (15th-century bathhouse), the Bezesteni (covered market), and several mosques that survive in varying states of preservation. Thessaloniki is significantly less visited than Athens, which makes engaging with the sites considerably more manageable.

Best for: travellers who want the deepest concentration of Byzantine architecture in Europe outside Istanbul, with Ottoman heritage as a substantial secondary layer.

Sofia

Sofia's historical layers include significant Byzantine and Ottoman elements. The Alexander Nevsky Cathedral is a 20th-century Bulgarian Orthodox church, but the 4th-century Rotunda of St George is a surviving Byzantine structure still used for worship, sitting within a Roman courtyard in the city centre. The Banya Bashi Mosque (1567) is one of the oldest functioning mosques in the Balkans and remains active. Sofia is affordable, compact, and undervisited relative to its historical depth.

Best for: travellers who want Byzantine and Ottoman history in a genuinely off-the-beaten-track Balkan capital at low cost.

Sarajevo

Sarajevo is the strongest Ottoman city in the Western Balkans. The Baščaršija (old bazaar) district is a functioning Ottoman commercial quarter that has remained largely intact: copper craftsmen, coffee houses serving Bosnian coffee in džezva pots, mosques at every turn. The Gazi Husrev-beg Mosque (1531) is the finest Ottoman mosque in the Balkans outside Istanbul. Sarajevo is not primarily marketed as an Ottoman heritage destination, but it is exactly that, and the combination of Ottoman history with the more recent history of the siege makes the city one of the most genuinely complex places to visit in Europe.

Best for: travellers who want Ottoman urban heritage at its most intact and lived-in, in a city where history from multiple centuries is simultaneously present.