If the Sun were a soccer ball right here, Neptune would be 0.46 mi (739 m) away — about a 11-minute walk.
Mercury, Venus, Earth, Mars are all within 123 ft (37 m) of the pin. Earth itself would be 0.082 in (2.1 mm) across.
Walk the real one — Grand Central West: 42nd Street to the Hudson1.61 mi (2.59 km) away, starting at The Opal Clock, Grand Central Main Concourse. We built this one on foot: every stop is a real place we chose, checked and photographed.
This is the training-wheels version. It drops the planets in a straight line from wherever you point. A walk worth doing comes from picking the stops on purpose — a post office for Mercury, water for Neptune — which is what the builder is for when you've got a minute to sit down with it.