Istanbul Layover: Sultanahmet From IST

Hagia Sophia, the Blue Mosque, the Basilica Cistern and the Grand Bazaar all stand within a fifteen-minute walk of each other on Istanbul’s historic peninsula, so a few free hours in the city buys four of its biggest sights rather than one.

Hagia Sophia and the mosaics in its upper gallery

Hagia Sophia has stood on the east side of Sultanahmet Square since 537, as a Byzantine cathedral for nine centuries, an Ottoman mosque for five, a museum from 1935, and a working mosque again since 2020. The dome is 31 metres across and carried on pendentives that were an untried piece of engineering when Justinian’s builders put them up.

The prayer floor is free and open to anyone. Foreign visitors go up to the gallery instead, on a 25-euro ticket, and that is where the mosaics survive: the Deësis panel of Christ flanked by the Virgin and John the Baptist, and the imperial portraits along the south wall. Buying a timed entry ticket in advance is the difference between walking in and standing in the square. Visiting hours run from 09:00 to 19:00 in summer and start later in winter, with the building closed to visitors for about half an hour at each of the five daily prayers and from roughly 12:30 to 14:00 on Fridays. A restoration of the main dome began in April 2025, so expect scaffolding inside until it finishes.

Bags go through a scanner at the visitors’ entrance, and every mosque on this route is entered barefoot with your shoes carried in with you.

The Basilica Cistern and its two Medusa heads

Justinian I had a reservoir dug under Yerebatan Caddesi, the street along the north side of Sultanahmet Square, in the 6th century: 336 marble columns nine metres tall, set in twelve rows of twenty-eight, holding 80,000 cubic metres of water for the palace above. Raised walkways run between them a few centimetres over what is left of the water, and the whole space is lit from the column bases upward.

Two columns in the northwest corner stand on carved Medusa heads, one lying on her side and one upside down, salvaged from some earlier Roman building nobody has pinned down. The daytime session runs 09:00 to 18:30 and an evening one from 19:30 to 22:00 costs more and comes with a light and sound programme; last entry is an hour before each closes. Both are ticketed at the door, and a pre-booked entry ticket takes the ticket office out of the queue.

The Bosphorus ferries from Eminönü

Eminönü’s piers sit at the northern foot of the historic peninsula, where the Golden Horn opens into the Bosphorus. Public commuter ferries leave from here for Üsküdar and Kadıköy on the Asian shore, about twenty minutes across, paid with an Istanbulkart, the stored-value card that also covers the metro and the tram. These are working commuter boats, not tour boats: the same crossing costs the same as a metro ride, and most of the deck is people going to work.

The sightseeing boats leave from the same stretch of water and do something different: an hour and a half up the strait and back, past the Ottoman palaces on both banks and under the two suspension bridges, with the Asian and European shores close enough on either side to tell apart. If that is the version you want, having a cruise ticket already booked saves working out which of the boats along the front is selling what.

The Blue Mosque’s 21,043 İznik tiles

Sultan Ahmed I finished his mosque on the west side of Sultanahmet Square in 1617, facing Hagia Sophia across a strip of garden, and gave it six minarets when two or four was the norm. The tile count inside is exact because someone did the arithmetic: 21,043 of them, in more than fifty patterns, concentrated in the galleries, with about 260 windows above them.

It has never charged admission and still doesn’t. Visitors go in through a side door rather than the main courtyard entrance, and the building closes to them during each of the five prayers and until around 14:30 on Fridays. Scarves and wraps are handed out free at the entrance for anyone who arrives without their shoulders, knees or hair covered.

The Grand Bazaar’s sixty-one covered streets

Mehmed II started the Grand Bazaar in the winter of 1455, on the ridge between Beyazıt and Nuruosmaniye, as two stone halls for cloth and jewellery that the rest of the market then grew around. It now runs to 61 covered streets and more than 4,000 shops behind 18 gates, and walking in costs nothing. It opens 09:00 to 19:00 and closes on Sundays and public holidays, which is the one scheduling trap on this itinerary.

Out of the gates on the Beyazıt side, in a courtyard between the bazaar and Beyazıt Mosque, is what survives of the Sahaflar Çarşısı, the second-hand book market that has traded on or near this spot since the Ottoman booksellers served the students at the mosque schools. A fire in 1950 took most of it and twenty-three shops came through; they were rebuilt in concrete around a bust of İbrahim Müteferrika, who ran the first Turkish-language printing press. It is a courtyard of paper and old maps two minutes from 4,000 shops, and the noise drops as soon as you are through the gate.

Süleymaniye Mosque above the Golden Horn

Mimar Sinan finished Süleymaniye in 1557 on the third of Istanbul’s seven hills, and its walled terrace still looks straight down the length of the Golden Horn to the bridges. It is the largest Ottoman mosque in the city and free to walk into, and the courtyard outside it is where people sit when Sultanahmet Square is full.

The climb up from the Grand Bazaar takes about ten minutes and is steep in the last stretch. Suleiman the Magnificent and his wife Hurrem Sultan are both buried in the garden behind the mosque, in domed tombs that are open to visitors and usually empty. If the day has run short, this is the stop to leave out; if it hasn’t, it is the best view on the peninsula that costs nothing.

Two metro lines and no single ride to the airport

Getting to Istanbul Airport means changing trains. From the old city, the M2 metro runs north from Vezneciler or Şişhane to Gayrettepe in about twenty minutes, and the M11 airport line goes west from there to the terminal in about thirty. The interchange at Gayrettepe is a long one, close to ten minutes of walking between the two sets of platforms, and that walk sits outside the ride times quoted for either line.

Door to door from Sultanahmet, budget 80 to 100 minutes, and add the two to three hours a long-haul departure wants on top of that: on an eight to ten hour layover that still leaves most of a day in the city. Every leg is paid with an Istanbulkart, and the airport run costs around a euro on it. The M11 starts running about 06:00 and the last train back toward the airport leaves Gayrettepe some time after midnight, with published times varying by source, so confirm it on the day if your flight is a very late one.

None of the four stops above has a cloakroom, the cistern’s walkways are narrow and damp, and the bazaar’s aisles are not the place to discover either. Leaving the suitcase at a storage point in Sultanahmet before the first stop is what makes the rest of it a walk.