Ávila, capital of the Spanish province of the same name, is a city in the rolling hill country northwest of Madrid. It’s best known for its intact medieval walls, with 80-plus crenelated, semicircular towers and 9 gates, including the arched Alcázar, on the eastern side. Long sections atop the walls are walkable. At night, the lighted walls are a distinctive sight. I was declared a UNESCO site in 1985.