Nick Butter is running a marathon in every country in the world for Prostate Cancer UK.
A man from Bristol, who's aiming to run a marathon in every country in the world in an 18 month period, has reached day 500 of his challenge.
Nick Butter is aiming to raise £250,000 for Prostate Cancer UK - you can donate via this link:
Nick's also looking for people who want to run marathons with him across the world.
There are more details here: