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,
ISIL-related terror attacks in France soldiers guarding a principal entrance to the Louvre Museum in Paris, France, attacking and injuring one soldier with a machete. The soldiers were patrolling the Museum as part of Opération Sentinelle, guarding the Carrousel du Louvre. Immediately after his arrest, the suspect told authorities that he was carrying spray paint in order to deface the museum's artwork, an act that he regarded as a "symbolic" attack on France. On 18 March 2017, in the March 2017 Île-de-France attacks, a pair of terrorist attacks by the same individual occurred in Garges-lès-Gonesse, an outer suburb of Paris, and Orly Airport near Paris.