De Rotterdam is one of the well constructed buildings of Netherland. The architect, Rem Koolhaas gave it an ideal and beautiful look. This is one of the biggest buildings of Europe. It is not only big but also one of the most beautiful vertical buildings in the world. It has three mix style towers, beautiful accommodation areas, commercial center, residential apartments, conference hall, restaurant and cafes for the visitors. The best thing of this building is that it has an indoor swimming pool where lots of people enjoy different water games in summer.