Tom Tower, Oxford

Standing over the entrance to the most famous Oxford college, Tom Tower is a landmark in itself. This imposing octagonal tower with a lead-covered cupola was designed by Sir Christopher Wren and completed in 1682. It was constructed on top of an archway and turrets dating from the 16th century and houses Great Tom - the loudest bell in Oxford. Weighing more than seven tons, the bell chimes 101 times at 9.05p every evening to recall not only the 101 students residing in Christ Church when the tower was completed, but also the time by which they were supposed to be in bed.