Calle de Alcalá is one of the longest streets in Madrid, Spain, stretching approximately 10 kilometers. It begins at Plaza de Cibeles and runs eastward, passing through various neighborhoods and connecting to important landmarks. The street is known for its mix of historical and modern architecture. Along Calle de Alcalá, visitors can find notable sites such as the Metropolis Building and the Catedral de la Almudena. The street is also home to numerous shops, restaurants, and cultural venues, making it a vibrant part of the city's urban landscape.