Walk the solar system — at actual scale.
Each planet is a real landmark in your city, at its true distance from the sun. Browse a mission and go walk it.
Featured missions
Pick a walk and preview the full route before you set out.
Don't see your city? Plan your own walk — the builder generates a true-scale route from any landmark you choose.
How it works
Four steps to get going — the same ones printed on the back of every postcard.
Choose your mission
Browse the walks we've mapped and preview the whole route — every stop, the distance, the time on foot — before you set out.
Walk to the Sun
Every mission starts at a real landmark standing in for the Sun. Its size sets the scale for everything that follows.
Scan the GO code
One code does it all. It knows where you are in the walk and points you at your next stop, every time you scan it.
Meet each planet
Scan the AR code when you arrive and the planet appears at true scale on the street in front of you. Take the photo, then keep walking.
One card. Every city.
Pick up a sun card and start your first mission — no accounts, no app install. Just a card and your phone.
SUN CARD