Is this heaven? Porsche reveals unreleased concept cars

Porsche has launched its 'Unseen' series, giving a glimpse into an array of design studies and concept cars created by its designers between 2005 and 2019, but never before revealed to public eyes. A total of 15 concepts have been unveiled by the carmaker, though we've selected a handful of our favourites to focus on in this story. Created in 2017, the 919 Street is pitched as a less extreme, potentially-road-legal version of its title-winning 919 Hybrid LMP1 race car.