Your complete guide to Istanbul – from Hagia Sophia to hidden gems. Learn about the city’s Roman, Byzantine & Ottoman past, where to eat, and how to navigate like a local.
Istanbul (formerly Constantinople, Turkish: İstanbul) is the largest city in Turkey and its main port. Located in the northwest of the country on the shores of the Bosphorus Strait, which connects the Black Sea and the Sea of Marmara. Istanbul is the only city in the world that spans two continents—Europe and Asia. This ancient metropolis was the capital of three great empires throughout its history: Roman, Byzantine, and Ottoman. All of this has made Istanbul one of the most fascinating cities in the world, with a unique cultural and historical heritage.
Istanbul geographically and culturally bridges Europe and Asia, giving it a distinctive charm and atmosphere. Over its long history, the city has been the heart of mighty empires, called the “New Rome,” and considered the center of the civilized world. Istanbul’s landmarks can captivate anyone: the famous Hagia Sophia, the elegant Blue Mosque, the Basilica Cistern, Topkapi Palace, and the Grand Bazaar. A trip here promises unforgettable experiences and countless discoveries.
Today, Istanbul is Turkey’s largest cultural and financial center. The Bosphorus Strait divides it into European and Asian sides, connected by tunnels and bridges. This sprawling modern metropolis is the largest city in Europe, home to nearly a fifth of Turkey’s population. Istanbul also ranks among the top five most visited cities in the world.
Istanbul is situated on the hills of northwestern Turkey, on both shores of the Bosphorus Strait. The southern part of the city lies along the coast of the Sea of Marmara. The European side of Istanbul is divided by the Golden Horn, a narrow inlet.
The climate is subtropical. Summers are warm, with average temperatures ranging from 20-28°C (68-82°F). Extreme heat is rare. Winters are cool, with occasional subzero temperatures and unstable snow cover. Cold fronts can significantly affect the weather during winter. Despite mostly positive temperatures, high humidity and wind make the cold season less pleasant. Annual precipitation ranges between 800-900 mm, with most rainfall occurring from October to March.
The best time to visit Istanbul is from April to June and September, when the weather is usually comfortable with little rain. July and August can be quite humid.
The first settlements in modern-day Istanbul date back to the Neolithic era. Records mention the city in the 7th century when Greek traders settled on the Asian side of the Bosphorus. In 667 BC, the city of Byzantium was founded by Byzas of Megara. Thanks to its strategic location, Byzantium grew and prospered. In the 1st century BC, it came under Roman rule. Several peaceful centuries were followed by decline under Emperor Septimius Severus. In the 3rd century, Byzantium faced constant barbarian attacks, leaving only ruins of the Hippodrome from Roman times.
A turning point came in 324 AD when Emperor Constantine moved the Roman Empire’s capital here, calling it “New Rome.” The name didn’t stick, and it soon became known as Constantinople. Constantine rebuilt the city, expanding it several times over. In the 5th century, after the fall of Rome, Constantinople became the capital of the Eastern Roman (Byzantine) Empire. For nearly a thousand years, it was a major center of science and culture in Europe, remaining the Byzantine capital until the 15th century.
During the Byzantine era, Constantinople was one of the largest cities in Europe, a wealthy and flourishing ancient metropolis. Constantine recognized the strategic advantage of Byzantium’s location between Europe and Asia and on the maritime route from the Black Sea to the Mediterranean. Political instability in Rome also influenced his decision. He encouraged migration to the new capital and brought artworks from across the empire.
In the 5th century, the Western Roman Empire fell, and Constantinople became the sole heir to Rome’s legacy. In the 6th century, Emperor Justinian ushered in a golden age for Byzantium and Constantinople, though the city suffered a bloody revolt in 532. In 626, it was besieged by the Avars. Later history was marked by rebellions and dynastic struggles. In 1204, Crusaders sacked Constantinople, leading to its decline. In 1453, the Ottomans captured the city, making it their imperial capital and ending the Byzantine Empire.
Constantinople remained the Ottoman capital until 1922. The Ottomans transformed the city, converting churches into mosques. The 16th century marked a new golden age, with magnificent buildings constructed. In 1845, the first bridge spanned the Bosphorus, and steamships began operating five years later.
After Turkey’s defeat in World War I, Allied forces occupied Constantinople. It was liberated in 1922 by Mustafa Kemal Atatürk, who moved the capital to Ankara. In 1930, Constantinople was officially renamed Istanbul.
Istanbul is a major European transport hub, easily accessible from most large cities in Europe, Asia, and global capitals. The largest airport is Istanbul Atatürk Airport, 20 km west of the city, connected to the center by metro and bus. Sabiha Gökçen Airport, 50 km away, serves many budget airlines. The cheapest way to reach the European side from here is by taking the E10 or E11 bus to Kadıköy, then a ferry. Trains link Istanbul to Ankara and Edirne. Direct buses operate from cities in Greece, Bulgaria, and Romania.
Istanbul has a complex public transport system, including four metro lines, four tram lines, two funiculars, numerous bus routes, and ferries. Travel requires a special card or tokens sold at stations. Fares are fixed regardless of distance.
Istanbul offers excellent shopping, from Eastern bazaars to brand-name stores and modern malls. The Grand Bazaar, visited by 200,000–400,000 people daily, is now more of a tourist attraction with inflated prices. Major malls are in the New City and western suburbs. For clothing and shoes, head to Nişantaşı (European side) or Bağdat Avenue (Asian side). The lira is the main currency, though dollars and euros are often accepted. Some shops close on Sundays.
What to Bring Back from Turkey
Finding a place to eat in Istanbul is easy, with options for all tastes and budgets. Popular traditional dishes include various köfte and kebabs, spicy beyran soup, grilled iskender, and fish or vegetable soups.
Istanbul is undoubtedly one of the world’s most fascinating cities, with landmarks from Roman, Byzantine, and Ottoman times. The historic areas between the Golden Horn, Sea of Marmara, and Bosphorus are a UNESCO World Heritage Site.
The most famous attractions are in Sultanahmet: Hagia Sophia, Basilica Cistern, Blue Mosque, and Topkapi Palace. North of the Golden Horn lies Galata, crowned by its iconic tower. From Galata, the lively İstiklal Avenue leads to Taksim Square. Beyond Taksim is the New City, Istanbul’s business and financial heart with skyscrapers and modern centers. Across the Bosphorus, the Asian side centers on historic Kadıköy and Üsküdar.
Hagia Sophia (Ayasofya) – One of Istanbul’s most iconic landmarks, a grand Christian cathedral converted into a mosque during Ottoman rule. This masterpiece of Byzantine architecture is now a museum. Built in 536 by Emperor Justinian, it was the world’s largest building for nearly a thousand years. After the Ottoman conquest, it became the Ayasofya Mosque. In 1935, Atatürk declared it a museum.
Hagia Sophia preserves much of its Byzantine heritage, with stunning gold mosaics, vast naves, and domes. The entrance features a glittering mosaic of Christ, while the apse depicts the Savior and Virgin Mary. Fragments of Archangels Michael and Gabriel remain above. Ottomans added a mihrab (prayer niche facing Mecca) and Arabic inscriptions. More mosaics adorn the dome and upper galleries.
At the exit, note the bronze gates (2nd century BC) and a mosaic of the Virgin Mary with Emperors Constantine and Justinian. Left leads to a 6th-century baptistry turned sultan’s tomb; right, to a 16th-century hamam.
Blue Mosque (Sultanahmet Camii) – Another iconic landmark, a masterpiece of Islamic architecture built between 1609–1616 by Sultan Ahmed I. Its six minarets (matching Mecca’s Grand Mosque) and blue-tiled interior make it a standout. Behind it, the Arasta Bazaar offers quality souvenirs. Nearby, the Great Palace Mosaic Museum displays excavated mosaic pavements.
Theodosian Walls – Well-preserved ancient fortifications marking old Constantinople’s western edge. Mostly 5th-century, they stretch 7 km. A walk here evokes the city’s Byzantine past.
Topkapi Palace – A 15th-century marvel built by Mehmed the Conqueror on the Bosphorus shore. The Ottoman sultans ruled here until the 19th century. This sprawling complex features lavish courtyards, the Harem, imperial council chambers, and relics of Prophet Muhammad.
Basilica Cistern – An eerie underground reservoir from the 6th century, supported by 336 columns. Famous for its Medusa-head column bases and featured in Dan Brown’s “Inferno.”
Hippodrome – Ruins of a Roman chariot-racing arena, once central to Byzantine life. Surviving monuments include an Egyptian obelisk, Greek column, and stone obelisk.
Grand Bazaar – The world’s first shopping mall, a labyrinthine covered market with 11 gates. Over 200,000 visitors daily explore its 4,000 shops.
Süleymaniye Mosque – Istanbul’s largest active mosque, a 16th-century masterpiece with a 53-meter dome and slender minarets. The surrounding garden holds an old Ottoman cemetery.
Spice Bazaar – Istanbul’s second-largest market, filled with sweets, dried fruits, nuts, and spices. A grand 17th-century mosque stands near the main entrance.
Dolmabahçe Palace – A 19th-century Ottoman Revival palace replacing Topkapi as the sultans’ residence. Opulent interiors blend Rococo, Baroque, and neoclassical styles with gold leaf and crystal chandeliers.
Chora Church (Kariye Museum) – A well-preserved Byzantine church with exquisite 14th-century mosaics and frescoes.
Little Hagia Sophia – A small Byzantine church converted to a mosque. Justinian built it as a prototype for Hagia Sophia, originally dedicated to Saints Sergius and Bacchus.
Rüstem Pasha Mosque – A 16th-century gem with intricate Iznik tilework, near the Spice Bazaar.
Yedikule Fortress – A 5th-century fortress forming part of Constantinople’s walls. Once housed the Golden Gate.
Galata Tower – A 14th-century Genoese tower offering panoramic views. The surrounding district is lively with cafes and nightlife.
İstiklal Avenue – A bustling pedestrian street stretching from Galata Tower to Taksim Square, lined with shops, cafes, and historic buildings.
Üsküdar – A historic district on the Asian side with old mosques, winding alleys, and wooden houses. The Maiden’s Tower, on a small island, is its iconic landmark.
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