In the mid-20th century the city began to develop. This is the time when Madrid experienced economic development and when the first modern buildings were built. Nowadays you can see remains of 17th and 18th centuries that reminds us of the distant past, for example, the ancient Main Square (Plaza Mayor) and the Royal Palace(Palazio Real).Usually winters are cold and dry and during the summer it is either nice and warm or very hot. The best time to visit Madrid should be autumn or spring because this is when the weather gets really nice and pleasant.