Frank Lloyd Wright Trust, Chicago

It's safe to say that Frank Lloyd Wright is a household name, partly because he put his name on so many houses. The sites overseen by the Frank Lloyd Wright Trust receive nearly 150,000 visitors a year—tangible proof that the visionary's impact on architecture, design, and culture remains alive and well. To ensure that legacy continues, the Chicago-based nonprofit runs tours at several of Wright's buildings and hosts various educational programs.

Home and Studio: Unity Temple. Robie House. The Rookery Light Court remodeling. All classic pieces of Modern architecture, and all designed inside the studio at 951 Chicago Avenue in Oak Park. From 1889 until 1909, Frank Lloyd Wright worked out of this residential space, eventually expanding the home to include a proper studio as demand for his services grew. Now an architectural destination in its own right, the Home and Studio welcomes guests seeking a look into the mind (and working conditions) of America's most famed architect. On tours, trained interpreters guide visitors through the space, sharing anecdotes and insights into Wright's work and home life.

Frederick C. Robie House: The crown jewel of Hyde Park's residential architecture, the Frederick C. Robie House was designed by Wright for the up-and-coming industrialist of the same name between 1908 and 1910. Widely hailed as one of the finest examples of the Prairie School of architectural design, the house has earned its share of accolades over the years, including a spot on the very first National Register of Historic Places in 1966. During tour, architectural experts guide groups through each of the house's significant features, from the cantilevered roof and prevalence of horizontal lines to the striking leaded glass windows that give the house its inner light. Tours also cover recent restoration efforts, giving guests an inside look at what it takes to preserve a historic home.