After studying phenomena related to the positions and motions of the Earth, Sun, and Moon, many students are familiar with the positional ordering of the planets, but their knowledge of the distances involved is vague. Scale models are one means of bringing extreme sizes into better focus, cutting them down to relative values that they can better comprehend. The Solar System in the Hallway activity consists of a scale model of the inter-planet distances set up in a hallway for students to explore. This article describes how to send your students on a trip to the Solar System via your school’s hallway!