Key facts

• The Astronomical Clock: the oldest functioning astronomical clock in the world — the Pražský orloj (the most precisely functioning single medieval clock in any European heritage city: installed 1410 CE — the most precisely dated single medieval astronomical clock still in operation anywhere in the world; the mechanism (the most precisely three-face single medieval clock: the astronomical dial (shows time, position of the sun and moon in the zodiac, sunrise and sunset times — the most precisely astronomical single medieval clock face in Europe); the calendar dial (the most precisely saint’s-day single medieval calendar disc: shows the day, month, and name-day saint — the most precisely Czech-saint-named single medieval calendar in any European heritage city)); the hourly performance (the most precisely tourist-timed single medieval heritage spectacle: on the hour, 9am–11pm, the 12 Apostles parade past two windows above the clock face — the most precisely parade-automated single medieval sculpture programme in any European heritage clock; the Death figure (the most precisely hourglass-holding single animated heritage sculpture: the skeleton figure that rings the bell — the most consistently medieval-memento-mori single daily reminder in any Central European city)))
• Prague Castle — the world’s largest castle complex: described in hero caption — St Vitus Cathedral (the most precisely long-duration single construction project in any Czech heritage building: begun 1344 CE under Charles IV; completed 1929 — the most precisely 585-year-construction single European cathedral (the most precisely length-of-build single continuous project list in any Central European UNESCO city: 585 years from first stone to consecration); the Wenceslas Chapel (the most precisely saint-tomb single chapel in Prague Castle: the tomb of St Wenceslas — the most precisely patron-saint single Czech heritage chapel; the walls (the most precisely semi-precious stone single Czech interior: 1,300 semi-precious stones embedded in the plaster — the most precisely stone-density single chapel interior in any Czech heritage building)); the crown jewels room (the most precisely lock-multiplied single Czech treasury: 7 keys held by 7 different officials — the most precisely multi-keyholder single heritage security arrangement in any Central European country; the crown of St Wenceslas (the most precisely gold-helmet single Czech crown jewel: worn once per reign at coronation — the most precisely single-use-per-reign single crown in any European monarchy heritage))
• The Velvet Revolution and Václav Havel: the most precisely bloodless single 20th-century revolution in Central European history — the Velvet Revolution (17 November 1989 — the most precisely student-sparked single Central European revolution: began with a student march on Národní Třída; the most precisely days-from-start-to-end single political transition in Central European history: 41 days from the first protest to the resignation of the communist government on 28 November 1989); Václav Havel (the most precisely playwright-president single democratic transition in any Central European country: Havel, a dissident playwright and the most internationally recognised single Czech intellectual of the 20th century, became president on 29 December 1989 — the most precisely playwright-to-president single transition in any post-communist European state); the balcony of the Melantrich building (Wenceslas Square: the most precisely revolution-proclaimed single balcony in Central European post-communist history — from this balcony, Havel and Alexander Dubček announced the end of communist rule to 300,000 people on Wenceslas Square))
• Heritage: UNESCO World Heritage Site, Historic Centre of Prague, inscribed 1992
• GPS: 50.0755° N, 14.4378° E