This clock erected in 2010 is probably the world's only clock from which no one can actually tell the time. The shape of the clock provoked the locals to invent many nicknames for the clock that we do not dare to mention.
A marble is released every day at 11 am to remind the story of Brno's heroic defense during the Swedish attack in 1645, which ended at 11 o'clock.
Wikipedia https://en.wikipedia.org/wiki/Brno_astronomical_clock
Address Náměstí Svobody, 602 00 Brno-Province
Coordinates 49°11'41.358" N 16°36'31.005" E