Sagrada Família

The Sagrada Família is a Roman Catholic basilica in Barcelona that has been under continuous construction since 1882 — and is still not finished. Designed by the Catalan architect Antoni Gaudí, who devoted the last 43 years of his life to the project, it is unlike any religious building on earth. The facades are encrusted with stone carvings that seem to have grown rather than been chiseled, the towers soar in clusters like organ pipes, and the interior glows with color in a way that feels closer to a forest than a church. UNESCO declared it a World Heritage Site, and it was consecrated by Pope Benedict XVI in 2010 — still incomplete.

Inside, the experience is genuinely overwhelming in the best possible way. The nave is flooded with colored light from stained glass windows designed to shift from cool blues and greens on the west side to warm ambers and reds on the east — the effect changes dramatically depending on the time of day. The columns branch upward like trees, supporting a vaulted ceiling of geometric complexity that Gaudí engineered using hanging chain models. You can climb the towers on two facades: the older Nativity facade (the ornate one, facing northeast) and the Passion facade (starker, more angular, facing southwest). Both offer vertiginous views over the Eixample grid and, on clear days, out to the sea.

Towers aside, the museum in the basement is worth the time — it includes Gaudí's original plaster models, reconstructed after anarchists destroyed them in 1936, and explains how his methods were so far ahead of their time that modern architects are still working out how to honor them. Construction is genuinely ongoing: the central tower of Jesus Christ is expected to be completed in the mid-2020s, which will make it the tallest church in the world. Tickets sell out days or weeks in advance, especially in summer, and timed entry is strictly enforced — buy online before you arrive.