1. Alcázar of Toledo
This square fortress dominates the skyline from every angle, serving as the city's most aggressive landmark. It has burned down and been rebuilt repeatedly over centuries, most recently after the Spanish Civil War siege that turned it into a nationalist symbol. Today, the massive stone courtyard feels austere and imposing, lacking the delicate ornamentation you will find in the city's religious sites, but the sheer scale is undeniable.
Inside, you will mostly find the Army Museum, which occupies the vast majority of the floor space. If you are not interested in military history, the building functions better as a viewpoint than a destination. The top floor houses the regional library, which offers a surprising and quiet escape from the stone corridors below. It is a functional government building as much as a monument, so do not expect the romantic palace vibes of Seville or Granada.
Most travelers exploring Toledo attractions use this as their compass point to navigate the labyrinthine streets. While the interior can feel sterile to some, the panoramic views from the terrace are arguably the best in the city, letting you trace the Tagus River as it wraps around the rock. It is a steep climb up from the lower town, so use the escalators from the parking garage if your legs are tired.