The district has changed over the years as various architectural designs have evolved to complement it. The boulevard was widened between 1909 and 1910 causing the Art Institute of Chicago Building to have to move the lions guarding its entrance back 12 feet. At that time, the Jackson Boulevard and Michigan Avenue intersection (the end of route 66) was known as "route center". Also at that time, the boulevard had no streets crossing it and extending eastward, and thus, the Jackson intersection was a T intersection. This was still true in 1920 when the Michigan Avenue Bridge opened and increased traffic by connecting this boulevard with the Magnificent Mile and the community north of the Chicago River a quarter mile to the north of this district. The "Fountain of the Great Lakes" (installed in 1913) was highly visible from route center. Today, four streets cross Michigan Avenue within the district (in addition to its northern and southern endpoints at crossing streets). Two of the four change names as they cross Michigan: eastbound East Monroe Street (100 south) becomes East Monroe Drive; and eastbound East Jackson Boulevard (300 south) becomes East Jackson Drive. Two-way East Ida B. Wells Drive (500 south) and East Balbo Drive (700 south) do not change names as they cross Michigan Ave.