Museum of Science and Industry (Chicago) of Progress event. For years, visitors entered the museum through its original main entrance, but that entrance became no longer large enough to handle an increasing volume of visitors. The newer main entrance is a structure detached from the main museum building, through which visitors descend into an underground area and re-ascend into the main building, similar to the Louvre Pyramid. In 1983, due to increased attendance, the museum started construction of its underground parking lot, located in three underground levels below the front lawn. Construction of the underground parking lot was finished in the 1990s. For over 55 years,
Paris in the Belle Époque way across Paris from Boulogne to Vincennes in 1856. But then it was purchased by the CGO, the main omnibus line, and remained simply a curiosity. Only in 1873 did the tramway begin to gain importance, when the CGO lost its monopoly on city transport and two new companies, Tramways Nord and Tramways Sud, one financed by Belgian banks and the other by British banks, began operating from the center of Paris to the suburbs. The CGO responded by opening two new lines, one from the Louvre to Vincennes, the other following the line of fortifications around the city. By