From Muppet Wiki

Grover's World Twirl is a Sesame Street-themed teacup ride at Sesame Place based on the theme of the Global Grover segments from the show. The ride opened in 2002.

Each tea-cup is painted with the design of a nation's flag and features a different Sesame Street character dressed in the cultural attire of the representing nation. For example, Grover showcases Mexican culture on a cup afront the design on Mexico's flag.