Grinnell is a global destination for architects, architectural historians, art lovers and those who appreciate the "built environment." From the downtown, which is listed as a National Register of Historic Places "Commercial Historic District," to historic neighborhoods to the Grinnell College campus, the city of Grinnell features a variety of structures that attract people from around the world. But the centerpiece of Grinnell's architectural heritage is the Merchants National Bank, which was designed by the legendary architect Louis Sullivan. Built in 1914, it is one of Sullivan's eight Midwestern "jewel box" banks. Designated a National Historic Landmark by the US Department of the Interior, the bank currently houses the Grinnell Area Chamber of Commerce.