The KPN-Zendmast Waalhaven, also known as Communication Tower, is a 191.5m (628.3feet) self-supporting telecommunications tower located in Rotterdam in the Netherlands that was built in 1962.[1] It is the tallest structure in Rotterdam and one of the tallest structures in the Netherlands. The tower is made of reinforced concrete with a metal transmitter at the top and at least one observation deck about halfway up.