Clock Tower, Palace of Westminster. Big Ben is the nickname for the great bell of the clock at the north end of the Palace of Westminster in London, and often extended to refer to the clock and the clock tower, officially named the Elizabeth Tower, as well. Wikipedia. Photo: Martin Bager.

Clock Tower, Palace of Westminster. Big Ben is the nickname for the great bell of the clock at the north end of the Palace of Westminster in London, and often extended to refer to the clock and the clock tower, officially named the Elizabeth Tower, as well. Wikipedia. Photo: Martin Bager.

Clock Tower, Palace of Westminster. Big Ben is the nickname for the great bell of the clock at the north end of the Palace of Westminster in London, and often extended to refer to the clock and the clock tower, officially named the Elizabeth Tower, as well. Wikipedia. Photo: Martin Bager.

Clock Tower, Palace of Westminster. Big Ben is the nickname for the great bell of the clock at the north end of the Palace of Westminster in London, and often extended to refer to the clock and the clock tower, officially named the Elizabeth Tower, as well. Wikipedia. Photo: Martin Bager.

Clock Tower, Palace of Westminster. Big Ben is the nickname for the great bell of the clock at the north end of the Palace of Westminster in London, and often extended to refer to the clock and the clock tower, officially named the Elizabeth Tower, as well. Wikipedia. Photo: Martin Bager.

Clock Tower, Palace of Westminster. Big Ben is the nickname for the great bell of the clock at the north end of the Palace of Westminster in London, and often extended to refer to the clock and the clock tower, officially named the Elizabeth Tower, as well. Wikipedia. Photo: Martin Bager.

Clock Tower, Palace of Westminster. Big Ben is the nickname for the great bell of the clock at the north end of the Palace of Westminster in London, and often extended to refer to the clock and the clock tower, officially named the Elizabeth Tower, as well. Wikipedia. Photo: Martin Bager.

Clock Tower, Palace of Westminster. Big Ben is the nickname for the great bell of the clock at the north end of the Palace of Westminster in London, and often extended to refer to the clock and the clock tower, officially named the Elizabeth Tower, as well. Wikipedia. Photo: Martin Bager.

Clock Tower, Palace of Westminster. Big Ben is the nickname for the great bell of the clock at the north end of the Palace of Westminster in London, and often extended to refer to the clock and the clock tower, officially named the Elizabeth Tower, as well. Wikipedia. Photo: Martin Bager.

Clock Tower, Palace of Westminster. Big Ben is the nickname for the great bell of the clock at the north end of the Palace of Westminster in London, and often extended to refer to the clock and the clock tower, officially named the Elizabeth Tower, as well. Wikipedia. Photo: Martin Bager.

Clock Tower, Palace of Westminster. Big Ben is the nickname for the great bell of the clock at the north end of the Palace of Westminster in London, and often extended to refer to the clock and the clock tower, officially named the Elizabeth Tower, as well. Wikipedia. Photo: Martin Bager.

Clock Tower, Palace of Westminster. Big Ben is the nickname for the great bell of the clock at the north end of the Palace of Westminster in London, and often extended to refer to the clock and the clock tower, officially named the Elizabeth Tower, as well. Wikipedia. Photo: Martin Bager.

Clock Tower, Palace of Westminster. Big Ben is the nickname for the great bell of the clock at the north end of the Palace of Westminster in London, and often extended to refer to the clock and the clock tower, officially named the Elizabeth Tower, as well. Wikipedia. Photo: Martin Bager.

Clock Tower, Palace of Westminster. Big Ben is the nickname for the great bell of the clock at the north end of the Palace of Westminster in London, and often extended to refer to the clock and the clock tower, officially named the Elizabeth Tower, as well. Wikipedia. Photo: Martin Bager.

Clock Tower, Palace of Westminster. Big Ben is the nickname for the great bell of the clock at the north end of the Palace of Westminster in London, and often extended to refer to the clock and the clock tower, officially named the Elizabeth Tower, as well. Wikipedia. Photo: Martin Bager.

Clock Tower, Palace of Westminster. Big Ben is the nickname for the great bell of the clock at the north end of the Palace of Westminster in London, and often extended to refer to the clock and the clock tower, officially named the Elizabeth Tower, as well. Wikipedia. Photo: Martin Bager.

Clock Tower, Palace of Westminster. Big Ben is the nickname for the great bell of the clock at the north end of the Palace of Westminster in London, and often extended to refer to the clock and the clock tower, officially named the Elizabeth Tower, as well. Wikipedia. Photo: Martin Bager.

Clock Tower, Palace of Westminster. Big Ben is the nickname for the great bell of the clock at the north end of the Palace of Westminster in London, and often extended to refer to the clock and the clock tower, officially named the Elizabeth Tower, as well. Wikipedia. Photo: Martin Bager.

Clock Tower, Palace of Westminster. Big Ben is the nickname for the great bell of the clock at the north end of the Palace of Westminster in London, and often extended to refer to the clock and the clock tower, officially named the Elizabeth Tower, as well. Wikipedia. Photo: Martin Bager.

Clock Tower, Palace of Westminster. Big Ben is the nickname for the great bell of the clock at the north end of the Palace of Westminster in London, and often extended to refer to the clock and the clock tower, officially named the Elizabeth Tower, as well. Wikipedia. Photo: Martin Bager.

Clock Tower, Palace of Westminster. Big Ben is the nickname for the great bell of the clock at the north end of the Palace of Westminster in London, and often extended to refer to the clock and the clock tower, officially named the Elizabeth Tower, as well. Wikipedia. Photo: Martin Bager.

Clock Tower, Palace of Westminster. Big Ben is the nickname for the great bell of the clock at the north end of the Palace of Westminster in London, and often extended to refer to the clock and the clock tower, officially named the Elizabeth Tower, as well. Wikipedia. Photo: Martin Bager.

Clock Tower, Palace of Westminster. Big Ben is the nickname for the great bell of the clock at the north end of the Palace of Westminster in London, and often extended to refer to the clock and the clock tower, officially named the Elizabeth Tower, as well. Wikipedia. Photo: Martin Bager.

Clock Tower, Palace of Westminster. Big Ben is the nickname for the great bell of the clock at the north end of the Palace of Westminster in London, and often extended to refer to the clock and the clock tower, officially named the Elizabeth Tower, as well. Wikipedia. Photo: Martin Bager.

Clock Tower, Palace of Westminster. Big Ben is the nickname for the great bell of the clock at the north end of the Palace of Westminster in London, and often extended to refer to the clock and the clock tower, officially named the Elizabeth Tower, as well. Wikipedia. Photo: Martin Bager.

Clock Tower, Palace of Westminster. Big Ben is the nickname for the great bell of the clock at the north end of the Palace of Westminster in London, and often extended to refer to the clock and the clock tower, officially named the Elizabeth Tower, as well. Wikipedia. Photo: Martin Bager.

Clock Tower, Palace of Westminster. Big Ben is the nickname for the great bell of the clock at the north end of the Palace of Westminster in London, and often extended to refer to the clock and the clock tower, officially named the Elizabeth Tower, as well. Wikipedia. Photo: Martin Bager.

Clock Tower, Palace of Westminster. Big Ben is the nickname for the great bell of the clock at the north end of the Palace of Westminster in London, and often extended to refer to the clock and the clock tower, officially named the Elizabeth Tower, as well. Wikipedia. Photo: Martin Bager.