Six amazing places to stay for free around the world – if you volunteer

At Helga’s Folly, a boutique hotel in historic Kandy, central Sri Lanka, amateur artists add to the distinctive murals – and get free bed and board via the Workaway website. Plus: 5 more places where skills can be swapped for stays

Francis Kéré becomes first African architect of Serpentine pavilion

The architect is planning to bring one of his characteristically stripped-back structures, honed in the villages of his native Burkino Faso, to leafy west London