Greenwich Park: Meridian Line 
Description
The Prime Meridian line of 0 degrees longitude runs through the park as well as the observatory. Rather than paying to go into the observatory there is a continuation of the line on the wall and floor of the path running around the front of the site which can be accessed without needing to pay the entrance fee.
Charge
Free
Getting There
Latitude: 51.478032; Longitude: -0.001391
What3Words: pushy.united.events
