Istanbul's Basilica Cistern: illuminated ancient columns reflected in water.

Visitors wander through the awe-inspiring Basilica Cistern (Yerebatan Sarnıcı) in Istanbul, Turkey, an immense underground water reservoir commissioned by Byzantine Emperor Justinian I in the 6th century. This architectural marvel, with its 336 marble columns, was originally built to supply water to the Great Palace and is now a captivating museum, dramatically illuminated and featuring contemporary art installations like the striking dark sculpture in the foreground.