Indoor farming is reshaping the agricultural landscape.

Growing crops inside without the need for sunlight or arable land is a great example of innovation tackling a major societal challenge – how to feed a growing global population. A number of locations – including skyscrapers, warehouses, and shipping containers – are being converted into farming properties.

By 2022 it is estimated the vertical farming market will be worth more than $6 billion.

And Philadelphia is the latest city to join the revolution. Tech company Metropolis Farms has announced it “will grow the equivalent of 660 outdoor acres worth of crops in less than 100,000 sq feet, annually.” The first crops will be planted next month.