The Astronomical Clock (Pražský orloj), which dates from the 15th century, is built into the front side of the Old Town Hall Tower at the Old Town Square.
To see the clocks intricate construction in motion, join the crowd in front of the tower and watch the Procession of the Twelve Apostles.
The spectacle takes place on the hour every hour, from 9am to 11pm: a trap door opens to reveal Christ marching out followed by his disciples, and a skeleton of death tolls a bell to a statue of a defiant Turk.
Below the Astronomical Clock, 12 medallions feature the signs of the zodiac. These were added in 1865 by the famous Czech painter Josef Manes.
Old Town Hall Tower
The Old Town Hall Tower (Staroměstská radnice) at the Old Town Square is one of the most striking buildings in Prague.
The tower was built as a solitary tower in 1338. Then in 1364, it was knocked into a private house adjoining it.
Shortly afterwards, this house was connected to houses on the other side, and the entire amalgamation of buildings became known as the 'Old Town Hall'.
In 1470, further integration work was carried out on the interior of the Old Town Hall, and the facade was remodelled in the Gothic style.
Visitors can climb to the top of the Old Town Hall Tower, to take in beautiful views over the Old Town Square and beyond.
Admission tickets are available from the ticket office at the base of the tower. Visitors can either walk up to the top or ride an elevator for an additional fee.
The ticket includes entrance to the Historical Halls of the Old Town Hall, which is where civic ceremonies are held, including weddings.
Tourist Information Centre
The reception area of the Old Town Hall houses a Prague Tourist Information Centre. It provides details of upcoming events in the city, on the museums and historical monuments, and on accommodation.
The centre can also supply you with a map of Prague and information on the Prague public transport network.
To discover more about the Astronomical Clock and Old Town Hall Tower, take a tour: Old Town, Astronomical Clock & Underground Tour.
Alternatively, tours of Prague include a visit to the Astronomical Clock in their itinerary:
Old Town & Jewish Quarter Tour
Prague Explorer Tour & Boat Trip
Prague City Tour
Prague City Tour & Boat Trip.