The tunnel was located in Epcot's Imagination Pavilion, specifically in the ImageWorks play area above the original Journey Into Imagination ride, according to WDW News Today.
Each person who entered the tunnel was assigned a color, which would follow them as they walked through. WDW News Today also reported that the spot became especially well-known after Michael Jackson was photographed there.
Despite its popularity, the tunnel was closed in 1998 when ImageWorks was moved to a lower level of the building, according to WDW News Today.
The tunnel will soon be coming back to Disney World, though it might look a little different. Today, parkgoers can visit Journey Into Imagination with Figment, an updated version of the classic Epcot ride. And soon, it appears that Disney may reintroduce its famous rainbow tunnel in a nearby section.
According to sources close to the project cited by WDW News Today, the walkway will be included in the upcoming Epcot Experience Center in The Odyssey, a new section that will be built in an abandoned pavilion. More details are expected to come in August, WDW News Today reports.