Athletes endure 63 laps and climb the height of Yr Wyddfa (Snowdon) in the unique race.
Marathon runners get used to a few ups and downs on the road to success - but perhaps not quite so literally as competitors in a "quirky" race in Essex.
A hundred runners paced 63 laps of a multi-storey car park - every floor, every ramp, round and round - for 26.2 miles (42km), at The Victoria Centre in Southend-on-Sea on Sunday.
It may not have been the most scenic dash, but organiser Jason McCardle said it sold out within seven minutes in November because runners loved taking it to the next level.
"It will take it out of them - it's 1,000m (3,280ft) elevation in total, so they'll be running just short of [the height of] Snowdon [Yr Wyddfa]," he added.
The race is billed as the only marathon in the UK, "if not the world", held in a multi-storey car park.
"It's a bit quirky, it's just different - a lot of these people have done hundreds of marathons and they've been on this road, that road, on trails," said McCardle.
"This sort of course will be more mental than physical towards the end – the repetition of running up and then running back down again, and there's not much to look at.
"It's quite difficult because it's concrete, not tarmac, so it's actually going to take it out of their legs, but they seem to be doing all right."
The winner was a man from Belgium with a time of three hours, four minutes, which McCardle said was "amazing for the amount of elevation".
Organiser Sussex Trail Events specialises in what McCardle called "strange" marathons, including at Southend Pier in October, an underground bunker, a prison and a tank museum.
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