The Theodosius Cistern, also known as Şerefiye Sarnıcı, is an ancient underground water reservoir located in Istanbul. Constructed during the reign of Emperor Theodosius II in the 5th century, this impressive structure served as a crucial water storage facility for Byzantine Constantinople. Visitors can marvel at the cistern's intricate architecture, featuring 32 marble columns and vaulted ceilings, all remarkably well-preserved.

The cistern's historical significance is highlighted through informative displays and exhibits, providing insights into its role in the city's water supply system and its engineering marvels. Enhanced by atmospheric lighting, the cistern offers a unique and immersive experience, allowing visitors to step back in time and appreciate the ingenuity of ancient builders. Whether you're a history enthusiast or simply looking for a fascinating site to explore, the Theodosius Cistern is a must-visit destination in Istanbul.