The climb that left me frozen with fear
There are thousands of industrial chimneys in the Czech Republic, with many dating back to the late 19th Century - most are no longer used and a group of enthusiasts spend their weekends climbing the structures. Alastair Lawson joined them in Zelezny Brod, but soon regretted it. I am 40m (130ft) up a 120-year-old chimney in the north-east of the Czech Republic and I am having a minor panic attack. My legs feel like lead weights as I look down on the tiny figures on the ground below me.