Daily Film Dose has a comprehensive [to say the least] list of the best long tracking shots of all time. Full post here. Below is one of the shots that made the list, from one of my all-time favorites, Goodfellas.
According to Daily Film Dose, "The other granddaddy of the long tracking shot is Ray Liotta and Lorraine Bracco’s walk through the Copacabana in “Goodfellas”. This shot’s serves to put the audience in the point of view of Karen, who is about to be swept off her feet by the temptation of the gangster lifestyle. This introduction to Henry’s world will counterpoint their eventual downfall later in the film. The movement of the camera through the tight spaces and long corridors while maintaining constant dialogue makes this shot an impressive maneuver and a benchmark in cinema.