Glee is the story of New Directions—William McKinley High School's glee club—in the small town of Lima, Ohio.
Football field, auditorium, and outdoor walkways used in first season. For season 2 a replica of the auditorium was built at Paramount Pictures Studio for filming.
Source: Glee Filming Locations — Tumblr
cafeteria, plaza, and gym used
From episode 1x12 "Mattress".
Will finds April Rhodes and sings karaoke in episode 1x16 "Home".
Performance of "Safety Dance" in the mall in episode 1x19 "Dream On". Performance of "Barbra Streisand" in episode 2x18 "Born This Way".
Carol and Burt get married in episode 2x08 "Furt".
Blaine and the Warblers sing "When I Get You Alone" to Jeremiah in episode 2x12 "Silly Love Songs".
Bieste and Will let off some steam at a country western bar in episode 2x14 "Blame It on the Alcohol".
Sam and his family are living in a motel in episode 2x19 "Rumours".
From episode 2x22 "New York". From episode 5x01 "Love, Love, Love".
Source: I Am Not a Stalker
Kurt and Rachel sneak off to have Breakfast at Tiffany's. From episode 2x22 "New York".
New Directions stay at the InterContinental while in New York for Nationals. From episode 2x22 "New York".
From episode 2x22 "New York".
Will checks out the theatre where CrossRhodes is playing while in New York in episode 2x22 "New York".
Finn and Rachel meet Patti LuPone From episode 2x22 "New York".
Kurt, Blaine, Sebastian, and Max visit West Lima's gay bar in episode 3x05 "The First Time".
Performance of "Summer Nights" from Grease in the stadium and "We Found Love" in the pool in episode 3x10 "Yes/No".
For skip day the New Directions ride the Viper at Six Flags in episode 3x15 "Big Brother".
Finn fixes a hot tub and considers moving to California with Puck to clean pools in episode 3x15 "Big Brother".
Source: alice-mediumdrip — Tumblr
Artie and Quinn go for their own skip day at the skate park in episode 3x15 "Big Brother".
Tina hits her head after falling in a fountain while texting and emerges as Rachel in episode 3x20 "Props".
The glee clubs attend the National's competition in Chicago in episode 3x21 "Nationals".
Rachel arrives in New York in episode 3x22 "Goodbye".
Finn picks Rachel up to take her to the train station in episode 3x22 "Goodbye".
Rachel leaves on the train in episode 3x22 "Goodbye".
Rachel spends a lot of time with her phone in Washington Square Park, be it taking photos with Brody or crying to Kurt in episode 4x01 "The New Rachel".
Rachel performs "New York State of Mind" for Carmen Tibideaux in the acoustically perfect Round Room in episode 4x01 "The New Rachel".
Rachel and Brody sing "Give Your Heart A Break" and Blaine sings "Teenage Dream" in episode 4x04 "The Break-Up".
Puck dresses up as a super hero for extra money in front of Grauman's Chinese Theatre in episode 4x07 "Dynamic Duets".
Rachel and Kurt discuss their decision to stay in New York over Thanksgiving in episode 4x08 "Thanksgiving".
Blaine surprises Kurt for a winter duet in 2012 Christmas special "Glee, Actually".
Puck and Jake sing and play guitar in a montage around Paramount Studios in 2012 Christmas special "Glee, Actually".
The Adam's Apples perform in episode 4x11 "Sadie Hawkins".