The document discusses several important buildings, including the Tower of London which was built in the 11th century by William the Conqueror for defense and later served as a prison, Big Ben which is a famous clock tower in London, the Eiffel Tower in Paris which stands 330 meters tall and was built starting in 1884, and the Statue of Liberty in New York Harbor which was designed by Frédéric Bartholdi and unveiled in 1886.