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 18th century the "Petits-Augustins" became officially the Museum of French Monuments. Construction begins on the church of "Sainte-Geneviève" (now the Panthéon). Paris in the 18th century Paris in the 18th century was the second-largest city in Europe, after London, with a population of about 600,000 people. The century saw the construction of Place Vendôme, the Place de la Concorde, the Champs-Élysées, the church of Les Invalides, and the Panthéon, and the founding of the Louvre Museum. Paris witnessed the end of the reign of Louis XIV, was the center stage of the Enlightenment and the French Revolution, saw the first manned flight,