euromast is an observation tower in rotterdam, netherlands. the tower was built from 1958 to 1960 for the 1960 floriade. it has been a national monument since 2010. to make the tower more stable, it was build on a block of concrete of . it has an observation platform high, and a restaurant. originally, at tall, it was the tallest building in rotterdam. then it lost that position for a few years. it became the tallest again when the "space tower" was built on the top of the building in 1970. the space tower made the euromast higher.