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.

Are there words adequate to describe the emotion of passing through the gates of Auschwitz? Can a photograph truly do justice to the memory of those who met their dreadful end in the gas chambers at the end of the railway tracks? Those were my thoughts as I entered the infamous camp, which left such an indelible stain on 20th-century history.

As the boundaries between the virtual and real worlds continue to blur, how can the search for adventure help us maintain genuine connections and experiences in life.

Can a moment in time ever be recreated? I once thought so, but after trying to duplicate this photograph for weeks, I realised the futility of living in the past.

Believe it or not, I came very close to leaving Toronto without photographing Niagara Falls. The weather forecast was for heavy rain, and I would need to go at a crazy hour to reach the falls in time for sunrise. But a break in the storm allowed me to experience a moment which will stay with me forever.

As a documentary photographer and writer, I am used to challenging assignments in far-off places. But as I stood, exhausted from many days of sleep and oxygen deprivation, staring up at the summit of Mount Kilimanjaro, the highest freestanding mountain in the world, I couldn't help but wonder if this would finally be a challenge too far?

As a photographer, I have always aspired to create photographs that have never been seen before: unique and spontaneous moments. But capturing certain photographs have become almost a rite of passage for any travelling photographer – even if they have been photographed thousands of times. This one is mine.

This is story of the most dangerous photograph I have ever taken. I didn’t plan for it to be so dangerous photograph but I made the mistake of ignoring the little voice of reason inside my head, and pretty soon everything was going downhill, in more ways than one.

As I stood at the mountain base, contemplating the climb, Pieter Both mountain formed an imposing sight. With its sharp vertical drops below and sheer cliff face above, the summit's climb is as much a mental challenge as physical.