That looks like an interesting book .   It is . It ’ s got pictures of interesting building from all over the world , with brief descriptions of how they were build , their purpose , and so on .   There are the pyramids . It ’ s easy to see how they got that name ! they don ’ t have smooth sides though .   They don ’ t now , but most of them did originally . There ’ s picture of the pentagon in the united states . It ’ s very distinctive with its five sides .   Look at that cylindrical office building . I ’ Ve never been seen one that shape before .   Yes . Usually only TV towers are cylindrical in shape .   TV towers are usually thicker at the bottom than at the top . They ’ re not perfectly cylindrical .   This is the world ’ s largest sports stadium . It ’ s a massive oval .   What sports do they play there ?   It says here that it ’ s m mainly used for big football matches and athletics meetings .   Is that building a perfect cube ?   According to the book , it is . I ’ Ve never seen a building that is a perfect cube . Look at the building . From the air , it looks like a square with a semi-circle attached to each of its four sides . What   Is says here that it ’ s a war memorial . Now , there ’ s a distinctive structure-the stomium in Brussels . See ? It consists of several connected by cylinders . I believe you can go up and down inside it . 