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The Kőbánya Water Reserve has been supplying Budapest with drinking water for nearly 150 years now. Its building – a genius work of engineering, designed by Italian experts – is stunning. It looks for all the world like an underground cathedral with arches, tall columns and many-hued mosaic-like bricks on the walls that are further colourised by the water.
Visiting the water reserve is a special experience, and since it is only drained and opened to the public once a year, something that is totally unmissable. Admission on Saturday is free and there's no need to register – only smaller groups will be allowed inside at any one time, so you may have to queue for a little bit.
Kőbánya Water Reserve (Kőbányai víztározó)
District X. Ihász utca 29
Saturday, 21 September 9am-4pm
How to get there: From Örs Vezér tere or Kőbánya-Kispest, take bus 85 to Ihász utca, or bus 95 from the Puskás Ferenc Stadion to Kápolna tér.