These pictures were sent in by Holger. He notes that the photo above was taken in at the basement level, while the picture below comes from the brasserie restaurant located at the observation level.
"The Euromast is 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 meters (30 ft) and a wall thickness of 30 centimetres (1 ft). For stability is it built on a concrete block of 1,900,000 kilograms (4,190,000 lb) so that the centre of gravity is below ground. It has a "crow's nest" observation platform 96 meters (315 ft) above-ground and a restaurant. Originally 101 meters (331 ft) 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 meters (279 ft). Euromast is a member of the World Federation of Great Towers."