Along with Toledo, Segovia is routinely ranked as one of Spain's best world heritage cities. There is so much to explore here, it would be a mistake to not allocate enough time. The Aqueduct, Alcazar, and Cathedral make up the main coordinates you navigate toward, while exploring small medieval streets, ruined monasteries, and the city wall which surrounds you.

The cathedral's upper stories require an additional ticket fee. For some this may not be worth it, the tour takes about an hour. However, the last 15 minutes of the tour are particularly rewarding as you get expansive views of Segovia.

In addition, Segovia's Alcazar also provides different options for the visitor. One allows the visitor to explore the palace and artillery museum, while the others gives access the Tower of Juan II (you can choose full entry). After viewing the cityscape from the cathedral, I opted out of the another vista and just visited the lower section.

The aqueduct is truly magnificent. I found it best in the evening before sunset. The swallows are a bit less active and the light more photogenic. 

There is far more to explore in Segovia than these 3 sites, but it would be a shame to miss any of these highlights.