As a large part of the city center of Rotterdam was destroyed during the Second World War, the few buildings remaining are definitely worth a visit.
Like, for example, the Witte Huis (White House) which was the first sky scraper in Europe in 1898.
Inspired by the sky scrapers in New York, this brick Art nouveau national heritage monument is no less than 11 floors and 45 meters high. An impressive achievement in that time and great sight to see today.
Video Witte Huis