Tower of London: Skip the Line Ticket From 24€! And more The Tower of London found on the West bank of the city is one of London’s greatest tourist attractions.The complex consists of several buildings, fortifications, which over the centuries has been used as a fortress, powder, royal palace and a prison for prisoners of noble families. The Tower was built in 1078 by William the Conqueror in order to defend the city from foreign invaders. A century later, the building was completed by Richard the Lionheart with the addition of a surrounding wall and a moat filled with water from the Thames. Today the Tower of London is UNESCO World Heritage Site and home to the precious jewels of the crown, as well as an elegant collection of the Royal Armory armor. The Tower is visited everyday by a large number of tourists, so it is advisable to buy tickets in advance or book a guided tour to skip the lines.