Charlie Maiorana is a self-taught artist who "for a number of years I have been displaying my constructions in a front yard Sculpture Garden for my personal enjoyment and for the enjoyment of my neighbors and the neighborhood children. The work displayed changes as I create new work and retire old."
Here's a video clip of his garden from 2014: https://youtu.be/3Sa5TURjp1w
You're looking for a magnetic nano in a typical urban hide. Although it's available 24/7 you should visit during the day to enjoy the sculptures.