The Palm House, Royal Botanic Gardens (3)#
Licensed under PD
Spiral stairs in Kew Gardens Temperate House or Palm House, the largest Victorian glasshouse in the world.
A walkway at a height of 9 m (30 ft) in the 19 m- (62 ft-) high nave allows visitors to look down upon the crowns of the palms. Kew Gardens is a UNESCO World Heritage site.