The spiral interior walkway in New York's Guggenheim Museum is called the ramp.
Frank Lloyd Wright organized the museum around a continuous spiral ramp that curves upward from the central rotunda. Visitors can move through the galleries along one connected path instead of progressing through a sequence of separate rectangular rooms.
The ramp is both circulation route and exhibition space. Artworks are displayed along its walls, while the open center allows visitors to see across levels and look down into the rotunda. Wright's design makes movement through the building part of the architectural experience.
The museum also contains conventional gallery areas, including spaces beneath and around the main rotunda. “Spiral ramp” is the precise description of the celebrated route; it is not an escalator, staircase, or separate outdoor walkway. Its continuous form is one of the building's defining innovations.