Old Town Hall & Astronomical Clock

The Orloj is the world's oldest astronomical clock still operating — built 1410, upgraded across six centuries, telling four kinds of time at once (Central European, Old Bohemian, Babylonian and sidereal) plus the sun and moon's zodiac positions, on a dial most viewers admire without decoding. The famous legend — clockmaster Hanuš blinded by the councillors so he could never build another, avenging himself by reaching into the mechanism — is medieval fake news the city adores too much to retire; the machine's real history (it stopped for decades, burned in 1945 when the Nazis shelled the Old Town Hall in the war's final days, and was resurrected each time) is better anyway.

On the hour, 9 AM to 11 PM, the Walk of the Apostles performs: Death the skeleton rings his bell and inverts his hourglass, the twelve apostles parade past the upper windows, the Turk shakes his head, the Miser and Vanity fidget, and a golden rooster crows the finale. It lasts 45 seconds. The crowd assembles for fifteen minutes, gasps politely, and disperses — it's the most famous 45 seconds in Central Europe and the correct response is affectionate amusement, not disappointment. Watch it once from the square (arrive 10 minutes early, guard your pockets), then do the thing most of the crowd never does: go inside.

The Old Town Hall ticket is the sleeper hit — the medieval underground rooms (the Romanesque town beneath today's street level), the council chambers, a close-up of the apostle figures from behind the clock face — and above all the tower: a ramped, lift-assisted climb to the gallery with the definitive Prague panorama, Týn Church's twin spires close enough to touch, the square's pastel façades mapped below, castle on the horizon. At the evening show times, the tower view down onto the upturned faces around the clock is the best people-watching frame in the city.

Sunset slots at the tower book out in season — take the online timed ticket — and the underground tour needs the guided slot. Pair with the square's other showpieces (Týn, St Nicholas, the Hus memorial) and a deliberate coffee OFF the square, one street back, where prices return to Czech.