Sagrada Familia: Gaudi's Basilica + Tower Climb
Step inside the most famous unfinished building on earth, where Gaudi's stone forest of columns explodes into a kaleidoscope of stained-glass light that moves across the floor through the day. Add the tower ticket to ride the lift up a spire and walk back down the dizzying spiral stair with the city at your feet. Buy a strict timed entry slot, go early in your port window, and you'll beat both the queue and the midday glare.