Link to iPhone calendar:

https://calendar.google.com/calendar/ical/l4ctcl99fp1na8h8rur4tdp4mc%40group.calendar.google.com/public/basic.ics

Open Google calendar in new tab:

https://calendar.google.com/calendar/embed?src=l4ctcl99fp1na8h8rur4tdp4mc%40group.calendar.google.com&ctz=America%2FChicago