In 1974 I took Ruth to Europe. It was her first time there, and we went "first class" (as opposed to my backpacking and hostel days). Part of our trip included a cruise up the Rhein (Rhine in English) River from Rotterdam in the Netherlands to Strassbourg in the Aslace. This is the Euromast, a tower in Rotterdam constructed between 1958 and 1960, designed by H.A. Maaskant. It was specially built for the 1960 Floriade. It is a concrete building with an internal diameter of 9 m and a wall thickness of 30 cm. For stability is it built on a concrete block of 1,900,000 kg so that the centre of gravity is below ground. It has a "crow's nest" observation platform 96 metres above-ground and a restaurant. Originally 101 metres in height it was the tallest building in Rotterdam. It lost this position for a while, but regained it when the "Space Tower" was added to the top of the building in 1970, giving an additional 85 metres. Euromast is a member of the World Federation of Great Towers. [Wikipedia]