Segovia packs an extraordinary density of monuments into a small walled city. The Roman aqueduct, the fairy-tale Alcázar, and one of Spain's last great Gothic cathedrals are all within comfortable walking distance of each other, linked by streets lined with Romanesque churches and Renaissance mansions. You can cover the main sights in a day, but the city rewards a slower pace.
The old Jewish quarter around Plaza del Corpus is one of the quieter pleasures — the old synagogue is now a church, but the streets retain their medieval character. The Vera Cruz church outside the walls is worth the ten-minute walk for both the building and the views back across the city. The Coining House below the Alcázar is an Atlas Obscura-worthy industrial monument: the first mechanised mint in Spain, built in the 16th century on a stream-powered hydraulic press.