Kew gardens the royal botanic gardens kew commonly called simply kew gardens is a world heritage site located in 300 acres of stunning vistas with 6 magnificent glasshouses set in a beautiful landscape beside the river thames between richmond and kew in south west london entrance includes kew gardens rhizotron and xstrata treetop walkway which takes you on a fascinating tour under the ground then 18 metres 59ft up in the air bringing you closer to the trees in a way that will take your b