A tiny 16th-century underground alchemists' laboratory on Haštalská 1, rediscovered after the 2002 floods, seen on a guided 30-minute tour.
🛡️ Independent — no pay-to-rank🔎 Graded for who you are✓ Verified 2026-06-17How we grade →
The verdict
Who it's worth it for
Great for
Travellers on a budget
If you've only got a day
Couples
Solo travellers
The genuinely curious
History & culture buffs
Local-life seekers
Depends
Families with kids
Not for
—
Worth it for travellers on a budget, if you've only got a day and couples.
Why we say this
Insider secrets & local vibes
A genuinely atmospheric squeeze down into a real underground Rudolfine-era cellar of furnaces and alchemical apparatus, uncovered after the 2002 floods — a quick hit of the city's occult past that you can't get from the street.
Not independently verified — estimated
It's a scripted, fixed-route 30-minute guided tour of a very small space, the legend-heavy patter outweighs verified history, and entry is on a set tour rather than a wander.
Not independently verified — estimated
The cellars are cramped and the tour runs in small groups on a half-hourly schedule, so you may wait for the next English slot in peak season.
Not independently verified — estimated
What it feels like
Reading the room, traveller by traveller
As a couple
A fun, slightly spooky 30 minutes off the Old Town tourist crush — worth it for the underground reveal, not a half-day plan.
Solo
A quick, curiosity-driven stop for anyone drawn to Prague's alchemy-and-Rudolf-II mythology.
With kids
Older kids enjoy the secret-tunnels theatre of it; the tight cellars and talky tour can lose younger ones.
Good to know
Before you go
Cost
Free (tip) to ~600 CZK
Time
2–3 hours
Last verified
2026-06-17
Best time
Morning, early in your trip, for orientation.
Getting there
Most tours muster on or near Old Town Square.
Booking
Book a small paid tour rather than a tip-based 'free' one for reliable quality.
Accessibility
Walking tours cover cobbles and some steps; check with the operator on pace.