Istanbul is not just a city — it is two continents sharing one address. Europe and Asia face each other across the Bosphorus Strait, and every corner carries layers of history stacked on top of each other: Greek, Roman, Byzantine, Ottoman. Hagia Sophia has been a church, converted into a mosque, turned into a museum, then converted back into a working mosque. Everything Istanbul has will stop you in your tracks from the very first day.
#1 Hagia Sophia
Possibly the greatest building still standing on earth. Built in 537 AD by Byzantine Emperor Justinian, the dome measures 31 metres in diameter and rises to the equivalent of a 14-storey building — it held the record for the world's largest dome for over 1,000 years. Today it functions again as an active mosque. Visitors can enter for free but must remove shoes and dress modestly; it closes briefly during prayer times.
- Entry is free but you must register online in advance during high season — the queue is extremely long without a reservation.
- Dress modestly; women must cover their heads. Headscarves are available to borrow at the entrance, and shoe bags are provided.
- Friday midday prayers close the site to visitors for 1–2 hours — plan around this.
#2 Sultan Ahmed Mosque
Turkey's most famous mosque and one of the most beautiful structures in the world. Built between 1609 and 1617 by architect Sedefkar Mehmed Agha, it is distinguished by its six minarets — a number that sparked real controversy at the time. Inside, more than 20,000 blue Iznik tiles cover the ceiling and walls, creating a luminous atmosphere when natural light filters through 260 windows. It remains an active mosque; visitors enter free outside prayer times.
- Entry is free, but you must wait for prayer times to finish — the mosque typically closes for 30–90 minutes around each of the five daily prayers.
- The best exterior shots come from the western side of Sultanahmet Park, especially in the evening when floodlights illuminate the minarets.
- The name 'Blue Mosque' comes from the Iznik tiles inside, not the colour of the exterior.
#3 Topkapi Palace
The administrative heart of the Ottoman Empire for more than 400 years, from the late 15th century to the mid-19th century. Today it is a museum holding Turkey's most valuable treasures: the elaborate Harem quarters, a Treasury room displaying the enormous Spoonmaker's Diamond alongside emerald-encrusted objects, and chambers said to hold sacred Islamic relics. The grounds are vast — allow at least half a day.
- Buy tickets online in advance. Standard entry runs 750–900 Turkish lira; the Harem requires a separate ticket — do not forget to add it.
- The site is enormous and tiring on foot. Start at the Gate of Salutation and move through the zones in order.
- The best Bosphorus viewpoint is the terrace at the rear of the palace — no extra charge to reach it.
#4 Grand Bazaar, Istanbul
The world's largest and oldest covered market, built in 1455. It stretches over 30,700 square metres, with more than 61 streets and over 4,000 shops selling everything from hand-woven carpets and spices to gold, leather, Turkish tea, and souvenirs. The atmosphere is loud, colourful, and perpetually busy. That said, many items are priced significantly higher than the markets outside — watch for overselling merchants, and know that bargaining is fully expected.
- Always bargain. The opening price is typically 50–200% above what you'll pay — don't feel awkward countering, and walking away often triggers a better offer.
- Gold sold here is reliable and comes with proper certification. For souvenirs, leather, and carpets, compare prices at the Spice Bazaar before committing.
- Be alert to people steering you into shops you didn't intend to enter — market touts are common. A polite refusal and walking on is all you need.
#5 Galata Tower
A medieval stone tower standing 66.9 metres tall, built by the Genoese in 1348 and one of Istanbul's most recognisable landmarks. Floors 8 and 9 hold a 360-degree observation deck with views across the Bosphorus, the Sea of Marmara, the Golden Horn, the Asian shore, and the city's full panorama of mosque domes. Lift queues can be very long during the day — an evening visit for sunset and the illuminated city is strongly recommended.
- Buy tickets online in advance or use the Museum Pass Turkey to skip the queue. Standard tickets cost 450–600 Turkish lira.
- The observation deck is narrow and gets crowded — not ideal if you dislike confined spaces or heights.
- The Galata neighbourhood around the tower has good cafés, second-hand bookshops, and art galleries worth exploring after you come down.
#6 Basilica Cistern
One of Istanbul's most atmospheric and beautiful sites. This vast underground water reservoir was built during the reign of Emperor Justinian around 532 AD to supply drinking water to the palace complex. It holds 336 stone columns, each 8 metres tall, standing in just a few centimetres of water in perfectly symmetrical rows. The highlight is the pair of giant Medusa head column bases — one placed upside-down, one on its side — whose positioning remains unexplained. The cool darkness is a complete sensory contrast to the streets above.
- Entry costs 300–450 Turkish lira. You can buy tickets online or use the Istanbul Tourist Pass.
- The interior is roughly 7–10 degrees cooler than outside — bring a light layer, particularly in summer.
- The floor is wet and slippery. Closed-toe shoes or non-slip soles are safer than sandals.
Where to stay in Istanbul for this trip
A well-located hotel means less commuting and more sightseeing. Here are real, top-rated stays in Istanbul — compare Agoda · Booking · Trip.com in one click.
Four Seasons Hotel Istanbul at Sultanahmet
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Boutique Saint Sophia Hotel
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Sura Hagia Sophia Hotel
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Radisson Hotel President Old Town Istanbul
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Tours, tickets & activities in Istanbul
Day tours, attraction tickets and travel essentials for Istanbul — book ahead on Klook with mobile e-tickets.
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Before You Pack
Istanbul is rewarding year-round, but spring (March–May) and autumn (September–November) offer the most comfortable temperatures. Plan at least 4–5 days to cover the European-side highlights properly. If time allows, cross to the Asian shore for a day — the pace of local life there is noticeably different and worth the short ferry ride.