Segovia twice in one day: once from a balloon basket at sunrise, once on foot through the Aqueduct, Cathedral, and Alcázar with an official guide. Nine hours, private balloon and transport included.
The balloon only flies within about an hour of sunrise, when the air is calm enough to control the ascent. You're airborne while Madrid is still dark, drifting over the Alcázar's turrets and the walled old town, then landing in a field outside the city for a Castilian breakfast and cava. Back on the ground, an official guide carries you through the Aqueduct, Cathedral, and Alcázar, the same three stops most day trips make, seen after you've already watched them from the air. It suits early risers more than late sleepers, and travelers who'd rather start a day trip mid-flight than mid-traffic.
You'll be back at your hotel by early afternoon, probably the only guest in the lobby who's already seen Segovia from above.