Machu Picchu was one of the vacation homes of Pachacutec Inca between 1438 and 1470, though some of its finest buildings and ceremonies demonstrate it was also used as a religious shrine. It is considered a masterpiece of both architecture and engineering due to its unique design and landscape features, and its mysterious history has made it one of the most popular tourist sites. Big Ben is the name of the great bell in the clock tower at the north end of the Palace of Westminster in London. Its official name was the Clock Tower until 2012 when it was renamed Elizabeth Tower in honor of Queen Elizabeth's Diamond Jubilee. The clock tower houses the world's four largest clock faces and is the