The Cisterns, or Cisternerne in Danish, represent a fascinating piece of Copenhagen's history as the former water reservoirs for the city. 🚰🌳 Located beneath the green expanse of Søndermarken park, opposite Frederiksberg Castle in Frederiksberg, these cavernous underground chambers once held a staggering 16 million litres of drinking water in total darkness. 🕯️💧 Today, this unique space is repurposed as a venue for art installations and exhibitions, offering visitors a surreal and atmospheric experience deep beneath the city streets.