After a fire destroyed its church around 1900, a Unitarian Universalist congregation asked one of its members, Frank Lloyd Wright, to design an affordable replacement. Using poured concrete with metal reinforcements—a necessity due to a small $40,000 budget—Wright created a building that, on the outside, seems as forbidding as a mausoleum, but inside contains all the elements of the Prairie School that has made Wright’s name immortal. Wright believed conventional church architecture was overpowering—he complained that he didn’t feel a part of the Gothic-style cathedral across the street, for example—and Unity Temple was intended to offer a new model for houses of worship. Today, it’s the only remaining public building from his Prairie period. It’s worth the extra dollars for the guided tour, where the docent explains why Unity Temple still feels groundbreaking 100 years later—and why Wright would consider that the ultimate compliment. Allow an hour.