Palais Garnier was created in 1874.

It is called le Palais Garnier, l'opéra Garnier, or simply l'opéra (event though there is now the second opera of la Bastille)

A Parisian palace is often referred to as a "palais" in French. Some famous Parisian palaces include the Palais Garnier, the Palais-Royal, and the Palais de l'Élysée.

The Palais Garnier, also known as the Opéra de Paris or Opéra Garnier, was designed by Charles Garnier. The link below will give further information.

The Palais Garnier, also known as the Opéra de Paris or Opéra Garnier, but more commonly as the Paris Opéra.