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 $3 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.