Manhattan’s High Line has rightly been gathering plaudits since the first section opened to footfall way back in 2009. Now a park in the sky is all very well, but it’s definitely got sunshine on its side. An idea to really push the boat out is an underground park, and that’s where our latest favourite Kickstarter idea comes in. With plans to harness solar technology via fiber-optic cables, The LowLine is the proposed transformation of a disused trolley terminal on Manhattan’s Lower East Side into an underground oasis of green.

Housing streetcars until it’s closure in 1948, the atmospheric 1.5-acre space is now the focus of a group of enthusiastic locals keen to make the most of its character-drenched cobblestones and vaulted ceilings. Already dreaming of weatherproof farmers’ markets, art installations and youth programmes, the next step is to build a full-scale representation of the LowLine – essential in convincing decision-makers that this thing’s a goer. In keeping with the nature of this grassroots project, you can pledge from $5 up – the bargainous cost of saying you were there from the start.