In what year was the Louvre Pyramid inaugurated?

The Louvre Pyramid was inaugurated in 1989.

The glass-and-metal pyramid was designed by Chinese-American architect I. M. Pei as the centerpiece of President François Mitterrand’s Grand Louvre project. It stands in the Cour Napoléon and functions as both an entrance and a skylight, directing visitors into the underground Hall Napoléon and distributing them toward the museum’s wings.

The pyramid and its underground lobby opened to the public on 29 March 1989, although related spaces and stages of the wider project had different opening dates. That distinction explains occasional references to other years or dates. The structure was controversial because critics considered its modern geometric design out of place beside the historic Louvre Palace, but it eventually became one of Paris’s defining landmarks.

The main pyramid is surrounded by three smaller pyramidions. It is about 21.6 metres high and uses 603 rhombus-shaped and 70 triangular glass panes. The nearby Inverted Pyramid is a separate underground skylight, not the structure named in this question.