The Hidden River Beneath Istanbul
Beneath the bustling streets of Istanbul’s old city lies a silent forest of stone — the Basilica Cistern, known to the Ottomans as Yerebatan Sarnıcı, the "Sunken Palace." It was built in the 6th century during the reign of Emperor Justinian I, at a time when Constantinople was thriving. The city’s booming population and growing palaces demanded a more reliable water supply, especially during sieges.