Santa Maria Maior de Lisboa looks more like an imposing medieval castle than your typical European cathedral. But what it lacks in extravagant adornments, it more than makes up for in its history. The facade and main structure follow a 12th-century Romanesque design, complete with rose window and crenellations. Elements added in the 13th century, including the cloisters and the beautiful ambulatory, adopted the Gothic style. Pay a small extra fee to see the Baroque-style sacristy, and continue your design time travel in the main chapel, which features the cathedral’s only use of Rococo elements. If you visit in the late afternoon, the sun hits a perfect angle through the stained glass of the rose window, projecting a jewel-toned glow on the walls and columns inside.