For a bird's-eye view of the contrast between Delfshaven and the majority of the city, as well as a spectacular panorama of city and harbor, visit the 600-foot-high Euromast. Designed by Rotterdam architect Huig Maaskant in 1960, this was the Netherland's tallest building for many years; when a new medical facility for the Erasmus University usurped the honor in 1970, an additional 25 feet were added to the tower in six days, restoring Euromast to its premier position. On a clear day, you can just about see the coast. The main observation deck is at 315 feet, but the Euroscoop is a rotating panoramic elevator that will carry you another 300 feet from there to the top of the mast. For the thrill seekers, you can skip the elevator and rappel down from the observation deck, or shoot down the rope slide in about 10 seconds on Europe's fastest "zip wire" (weekends from May to September; reservations at www.abseilen.nl). There's also a restaurant at the top. You can even stay in the tower overnight in one of two special suites, but be warned the prices are as high as the experience. Down below, the park at the base of the Euromast is where many Rotterdammers spend time when the weather is good.