Plaza de Castilla (Castilla Square), Madrid

Plaza de Castilla serves as a prominent transportation hub, with nearby access to Chamartín train station, bus stations, and metro stations. In this square, you'll find a white concrete sculpture honoring Calvo Sotelo, the Nationalist leader whose assassination in 1936 triggered the Civil War. At the center of the square stands a striking obelisk designed by Santiago Calatrava, which was donated to Madrid in celebration of its tricentennial.

Taking center stage at the junction are the iconic towers that lean towards each other, creating the "Puerta de Europa", or Gateway to Europe. These towers, known as the KIO Towers, rise over 100 meters and span nearly 30 floors. Notably, each tower is inclined at a 15º angle from the vertical. Adjacent to the towers, you'll find Madrid's emerging business district, characterized by the skyscrapers known as the "Cuatro Torres", or Four Towers. The tallest among them is Norman Foster's Torre Caja Madrid, completed in 2009, soaring to a height of 250 meters (820 ft) with 55 floors