Expect a cold, damp, and genuinely atmospheric walk through narrow corridors, heavy steel doors, and dimly lit rooms that once served as air-raid shelters or bunkers. Tours last 60-90 minutes and mix straightforward history with visible WWII-era features like ventilation systems, bunk beds, and escape tunnels. It's more documentary than thrill ride – you'll stand in the exact spaces where thousands waited out bombings. The experience is sobering rather than scary, though some sections feel claustrophobic if you're not great with tight spaces.
Spring and autumn are best; summer tours get uncomfortably warm and humid underground while winter means freezing temperatures and possible cancellations. Expect to pay around €15-25 per person depending on the length and depth of the tour. The longer "deep underground" options that visit lesser-known bunkers are worth the extra money over the basic ones.
Tip: Book the tour that focuses on a single well-preserved bunker complex rather than the sampler that jumps between several sites – you get more time and detail. Skip the add-on "ghost tour" versions; the straight history tour is far better. Wear sturdy closed shoes and bring a light jacket even in summer.
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