Admire the interior of Gaudí's unfinished masterpiece, the Sagrada Familia. Skip the lines and follow your guide through the heavy doors with hand-carved vines. Witness Barcelona from one of the towers. See the rows and rows of tree-like pillars that seem to reach to the heavens stretch out before you. Look up at the stained-glass windows and bathe in the warm light that filters through. Note the Christian iconography as you hear about the history of the church. Understand Gaudí's modernist vision as your guide brings the symbolism of the stonework to life. At the end of your tour, ascend one of the basilica's towers and gaze out over the views of Barcelona. Once back down at ground level, continue exploring the monument as long as you like.