For architectural history buffs, Robie House is a must-see. Frank Lloyd Wright designed this 20th-century American architectural masterpiece for Frederick Robie, a bicycle and motorcycle manufacturer. The home, which was completed in 1909, is a classic example of Wright's Prairie School of design, with its open layout and linear geometry of form. Wright prided himself on creating all-encompassing, stylistically harmonious environments, and he oversaw everything from the furniture to the exquisite leaded- and stained-glass doors and windows. It was among the last of Wright's Prairie School-style homes: During its construction, he abandoned both his family and his Oak Park practice to follow other pursuits, most prominently the realization of his Taliesin home and studio in Spring Green, Wisconsin. Docents from Oak Park's Frank Lloyd Wright Home and Studio Foundation lead 1-hour tours of the interior, and after a massive, 10-year restoration in honor of the house's 100th anniversary, it looks better than ever. Note: Advance reservations are a good idea in the summer.

A Wright specialty bookshop is in the building's former three-car garage -- which was highly unusual for the time in which it was built. Advance reservations are recommended in the summer; you can order tickets through Robie House's website. Allow 1 hour per tour, plus time to browse the gift shop.