| Building Name: | Euromast |
| Location: | Parkhaven 20 Rotterdam, Netherlands |
| Coordinates: | 51.9061°N 4.4658°W |
| Completion Date: | 1958-1960 |
| Renovation Date: | 1970 |
| Building Type: | Observation tower Hotel |
| Architectural Style: | Modernism |
| Antenna Spire: | 184.6m (605.6feet) |
| Roof: | 104m (341feet) |
| Elevator Count: | 2 |
| Architect: | Maaskant, van Dommelen, Kroos en Senf |
| Engineer: | A. J. van Neste R. Swart (engineer) |
| Main Contractor: | Aanneming Maatschappij J.P. van Eesteren |
| References: | [1] |
Euromast is an observation tower in Rotterdam, Netherlands, designed by Hugh Maaskant constructed between 1958 and 1960. It was specially built for the 1960 Floriade, and is a listed monument since 2010.[2] The tower is a concrete structure with an internal diameter of 9m (30feet) and a wall thickness of 30cm (10inches).[3] For stability it is built on a concrete block of 1900000kg (4,200,000lb) so that the centre of gravity is below ground. It has a "crow's nest" observation platform 96m (315feet) above ground and a restaurant. Originally 101m (331feet) in height it was the tallest building in Rotterdam. It lost this position to the high-rise of Erasmus MC (113.5m (372.4feet))[4] which was completed in 1968, but regained it when the Space Tower was added to the top of the building in 1970, giving an additional 85m (279feet). Euromast was the highest building of the Netherlands,[5] but was surpassed by De Zalmhaven, also in Rotterdam, in 2021. It is also a member of the World Federation of Great Towers. In 2008, 2009 and 2019, the tower hosted an extreme sports event which featured BASE jumping. A new event was expected in September 2022.