This isn’t the most famous door in the world, despite what you might have thought at first glance. Despite living in possibly the safest era in history, the door you are thinking of lies behind layers of iron gates, surveillance cameras, and armed police officers. The question is, why?

The story of the Prime Meridian, an invisible line that silently choreographs the dance of time and space across the globe, is a tale of science, power, and intrigue. But standing with one foot in each hemisphere, I wondered whether this arbitrary line of imaginary division has a greater significance in our increasingly divided real world.

For centuries, millennia even, people have gathered around a single focal point to share stories, sing, chant, make music and celebrate their communities. And yet, as the wheels of time have turned, these ancient practices have faded from memory as digital screens have become our new focal point.

In 2013 a bunch of "scruffy skateboarders" challenged the might of the cultural elite of London. At first, few took much notice, but over the next 18 months, the skateboarders unleashed the power of local support with dramatic effect.

At the age of 16, Janet Devlin became an overnight star. By the age of 20, she was an alcoholic. To her adoring fans, the singer from Northern Ireland had the world at her feet, but away from the public eye, her mental health was spiralling out of control.