Edited By: Pragati Bhandari

Clock Tower of Xi'an (1384)  Located in Xi'an, China, it's one of the oldest and features an intricate mechanical system.

Big Ben (1859) Officially known as the Great Bell of the clock at the north end of the Palace of Westminster in London, United Kingdom.

Prague Astronomical  Clock (1410)  Situated in Prague, Czech Republic, it's known for its astronomical dial and animated figurines.

Zytglogge  (Clock Tower of Bern) (1218) Located in Bern, Switzerland, it's a medieval clock tower with an astronomical calendar.

Wells Cathedral Clock (1390)  Found in Wells, Somerset, England, it's renowned for being one of the oldest working clocks in the world.

Salisbury Cathedral  Clock (1386) Located in Salisbury, England, it's one of the oldest working clocks in existence.

Rouen Cathedral  Clock (1389)  Situated in Rouen, France, it's famous for its astronomical clock and its complexity.