The construction was generally in stone and the roofs were built of tree trunks and thatched with straw.  The walls lean slightly inward to protect against earthquakes. Situated opposite Machu Picchu, is Huayna Picchu, the peak of which offers panoramic views of the imposing spread of the Machu Picchu ruins and the Urubamba Valley.  The subtropical climate means generally mild weather, the average year-round temperature during the day is 13ºC. There are two distinct seasons - the rainy season is from November to March and brings heavy rains.  The dry season from April to October brings higher temperatures.