Oliver and Johan have been climbing for a little over a year
They are a landmark of the capital city and synonymous with Dublin.
While electricity generation continues at Poolbeg, the chimneys themselves have not been used since 2010.
But they are still a big part of the skyline.
Now, one adventurer who was visiting Ireland made it his mission to climb one of them.
"I went out to the old and abandoned place one day, climbed over fences, jumped over walls and explored this awesome place", Oliver says.
"The scenery was amazing and I will never forget it. It took me a while to get up the 200 metre chimney and I was concerned about getting busted because I did it (in the) afternoon.
"I could easily be seen whilst I was climbing. The chimneys are not in use, but there is another part of the area which is.
"So there were security guards out there. I performed the climb without the use of safety equipment of any kind".
"It was truly beautiful and I will never forget the amazing view.
"It was an amazing feeling to reach the top. The pure satisfaction of actually getting there and the feeling of accomplishment."
He and his friend Johan have been climbing for a little over a year.