[{SlideShowNav}] !!!The Palm House, Royal Botanic Gardens (3) [{Image src='610uk.jpg' height='800' alt='The Palm House, Royal Botanic Gardens (3)' class='image_left' width='600'}] [{SET customtitle='The Palm House, Royal Botanic Gardens (3)'}] \\ 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.