If you haven't got a head for heights, you might want to look away now. These stunning images - which capture dizzying views of city life in London, Paris and Hong Kong from 600ft up - were taken by daredevil Andrew Tso.
The 26-year-old, from Hong Kong, has snapped the vertiginous images while 'rooftopping' across the globe.
The fearless climber's passion for scaling large buildings stems from a childhood love of mounting objects.
He said: 'Being at the top is always a thrill, and no matter what people say about being fearless, there's always an element of uncertainty and fear. Sometimes it makes me uncomfortable, but I feed off that tension and try to push myself a little more each time.'
In one of the self-taken photographs, Andrew is seen clinging to a lightning rod in Kowloon, China.
Other images show a view of the Causeway Bay district in Hong Kong from 500ft in the air and Andrew sitting on top of a gasometer in London. Andrew said: 'Your audience can really see how comfortable you are based on the quality of the photo.
'Sometimes you just have to put yourself in an awkward or unsure situation to capture what you want.'
In spite of his clear head for heights, Andrew does admit to feeling trepidation, but claims that it drives him on.
'These photos I take still terrify me sometimes,' he said.
'If there ever comes a day when heights don't make me uncomfortable, I'll stop taking these.'