The Great Hall

From Bandipedia, the Crash Bandicoot wiki

The Great Hall is the second-to-last level in the first Crash Bandicoot game. Despite the exit is accessible as soon as the player enters the level, it has a secret one (a balcony), which is unlocked when all of the gems in the game are gathered. By clearing the hall, you unlock the alternate ending.

Quite noteworthy is how the background music heard in this stage is used three years later, in the last section of the "scrapbook" seen in Crash Team Racing showing the whole Naughty Dog staff.

Crash Bandicoot Protagonists Crash Bandicoot | Aku Aku | Tawna Levels First Island (N. Sanity Beach • Jungle Rollers • The Great Gate • Boulders • Upstream • Rolling Stones • Hog Wild • Native Fortress) | Second Island (Up the Creek • The Lost City • Temple Ruins • Road to Nowhere • Boulder Dash • Whole Hog • Sunset Vista) | Third Island (Heavy Machinery • Cortex Power • Generator Room • Toxic Waste • The High Road • Slippery Climb • Lights Out • Fumbling in the Dark • Jaws of Darkness • Castle Machinery • The Lab • The Great Hall) Items Crates (Basic Crate • Aku Aku Crate • Bounce Crate • Arrow Crate • ? Crate • ! Crate • TNT Crate • Crash Crate • Checkpoint Crate • Bonus Crate) | Wumpa Fruit | Gem | Key Enemies Crab | Turtle | Skunk | Venus Fly Trap | Monkey | Tribesman | Flying Fish | Bat | Lizard | Snake | Spider | Hog | Holo-Projector | Robot | Machine Gunner | Barrel Thrower | Bird | Evil Hand | Lab Assistant | Rat | Blob Bosses Papu Papu | Ripper Roo | Koala Kong | Pinstripe Potoroo | Doctor Nitrus Brio | Doctor Neo Cortex