What is it, exactly?
Cisternerne is a former underground drinking-water reservoir beneath the lawns of Søndermarken park in Frederiksberg, opposite Frederiksberg Palace. Once holding 16 million litres of water, the vast, pitch-dark, echoing chamber — complete with dripping stalactites forming on the ceiling — has been turned into one of Europe’s most atmospheric contemporary-art spaces. Each year a single artist creates a site-specific installation that uses the darkness, damp and reflections; past shows have transformed it with mirrors, fog, water and light.
Is it worth visiting?
If you have any appetite for art or the unusual, this is unmissable and unlike anything above ground. Where a conventional gallery is bright and hushed, Cisternerne is cold, dark and dripping, and the art is built for exactly that. It is a genuinely local secret compared with the big-hitter museums, and it doubles as a cool escape on a hot day. Above ground, Søndermarken itself is a lovely, low-key park for a post-visit stroll.
How do you get there?
Take the Metro (M1, M2 or M3) to Frederiksberg station, then walk about 10 to 15 minutes through Frederiksberg Gardens and across to Søndermarken; the glass-pyramid entrances sit on the park lawn. Several buses also stop near Roskildevej and Pile Allé nearby.
When to go, and what it costs
The annual exhibition runs for much of the year (in 2026 roughly mid-March to late November) — always confirm current dates. Adult admission is around 120 DKK, with reduced rates for students and young people and free entry for under-18s; it is included with the Copenhagen Card. It stays cool year-round, so bring a layer and shoes with grip — the floor can be wet.
Insider tip
Let your eyes adjust for a few minutes at the bottom of the stairs before you judge the space — the installations reveal themselves slowly in the dark. Wear something warm even in summer; the temperature underground is a constant chill, and the acoustics are extraordinary, so pause and just listen.
