Treasures of the Opera Garnier Tour in Paris. Explore the decadent Opera Garnier in Paris on a 1.5-hour, comprehensive walking tour. Designed by French architect Charles Garnier in the late 1800s, this incredible Neo-Baroque opera house is one of Europe’s largest and is sure to leave you awestruck with its elegant interior. Explore the auditorium, main staircase (Grand Escalier), Grand Foyer and Member’s Rotunda with your expert guide, and hear how the building inspired the setting for the legendary ‘Phantom of the Opera’ musical. Book and Save 10% Off Treasures of the Opera Garnier Tour in Paris.