prague astronomical clock prazsky orloj on display on the old city hall staromestska radnice of prague, czech republic.

15th architecture astrolabe astronomical astronomy blue building capital century centurypicture cesko city citys clock clockwork czech czechia european focus golden hall historical history iconic landmark medieval mesto monument monuments most old one orloj prague praha prazsky radnice republic sightseeing sky square stare staromestska sun sunny technology time timepiece tourism tourist touristic tower town travel travelling visited