Madrid，Spain

Madrid International Airport is the main airport of Madrid, the capital of Spain. It is located 12 kilometers northeast of the center of Madrid and delivers 2.5 million passengers each year. It is the hub of domestic air transportation in Spain. The most distinctive feature of Madrid International Airport is the newly built terminal building. The giant roof of the terminal building is a continuous wave type supported by numerous giant "Y" shaped steel columns. The building is dominated by large areas of glass and domes, making full use of natural light. It not only saves energy, but also softens the light in the hall. Passengers can easily close the surrounding scenery and the dynamics of the aircraft.