Basilica Cistern

Where it sits. The Basilica Cistern lies under Alemdar Street in Istanbul's Sultanahmet district, about 150 metres southwest of Hagia Sophia and a short walk from the Hippodrome. Nothing marks it above ground but a modest stone entrance building; the visit begins by descending 52 steps into a brick-vaulted hall 138 metres long and just under 65 metres wide, covering close to nine thousand square metres. Three hundred and thirty-six columns hold up the roof in twelve rows of twenty-eight, each around nine metres tall, spaced roughly four and a half metres apart. The Turkish name, Yerebatan Sarnıcı, means the sunken cistern; the English name comes from the Stoa Basilica, the colonnaded public square that once stood above it.

The story behind it. The cistern in its present form was built under Justinian I in 532, in the reconstruction that followed the Nika riots, on a site that had held a smaller reservoir since the fourth century. It stored water brought from the forests north of the city through the aqueduct system associated with the emperor Valens, a network whose surviving arches still stride across the Atatürk Boulevard, and it held on the order of 80,000 cubic metres — enough to see the imperial quarter through a siege. Almost all the columns are spolia, salvaged from older buildings, which is why their capitals disagree with one another: Corinthian, Doric and plain Byzantine forms stand in the same row. Two column bases in the northwestern corner are carved Medusa heads of Roman date, one set on its side and one upside down, positioned for height rather than for any meaning later invented for them. A column carved with teardrop shapes, often called the weeping column, stands separately.

Rediscovery and restoration. Ottoman Istanbul largely forgot the cistern, and the French scholar Petrus Gyllius, hunting Byzantine antiquities in 1545, reported that residents of the houses above were lowering buckets through holes in their basements and occasionally hauling up fish. It was cleared and repaired at intervals, but the modern experience dates from a clean-out in 1985 to 1987, when tonnes of mud were removed and raised walkways installed. A second and much heavier restoration ran from 2017 to 2022: the columns were surveyed and strengthened against earthquake, a new steel walkway system was laid over the water, and lighting and contemporary sculpture were introduced. The cistern reopened in July 2022, considerably brighter and staged more theatrically than the murky space earlier visitors remember. The floor still carries a few centimetres of water, and carp move slowly between the column bases.

On screen. The cistern is the setting for one of the best-remembered sequences in From Russia with Love (1963), the second Eon Bond film, directed by Terence Young. Bond, played by Sean Connery, is rowed beneath the city by Kerim Bey, the head of station in Istanbul played by Pedro Armendáriz, to a chamber where a periscope allows them to look up into a Soviet consulate conference room. The film describes the reservoir as the work of Constantine, forgotten under the modern city, and it invents everything else: there is no periscope shaft, and the Soviet consulate stood in Beyoğlu, more than three kilometres away across the Golden Horn. What the film took from the real place is its geometry — the receding rows of columns and the black water that makes the hall look endless — with the periscope chamber itself built as a studio set. The unit worked in Istanbul in the spring of 1963, using Hagia Sophia and Sirkeci station in the same stretch of the film. The cistern was later used for the climax of Ron Howard's Inferno (2016), with Tom Hanks.

What to look for. Walk the full length before doubling back: the perspective down the long axis is the single strongest thing here, and it changes completely depending on whether you look along a row or diagonally across the grid. The brickwork of the vaults is worth studying for the mortar joints, a lime and crushed-ceramic mix that made the whole structure watertight without any lining. The Medusa heads are at the far northwestern end and are always the busiest spot. Note the height difference between column shafts, compensated with stacked plinths and reused bases, and the smoke and soot marks left from centuries of lamps.

Getting there and timing. Sultanahmet tram stop on the T1 line is two minutes away, and the cistern fits naturally between Hagia Sophia and the Blue Mosque. Tickets are timed, entry queues build sharply from mid-morning, and the first hour after opening is by some distance the quietest. Evening slots are also sold and give the strongest lighting effects. The air stays cool and damp whatever the season, so it works well as a refuge from July and August heat. The walkway is level once you are down, but the entrance stair and the absence of a lift rule out step-free access.