The Great Exhibition of 1851

Mrs Richards took a lump of sugar with the sugartongs and disclosed to her fastidious sister that Mr Richards had taken the hansom up to London. “Pray, what business has he there?” her sister scorned the frivolity.
“He will be visiting the Crystal Palace.”
Her sister sniffed misgivingly: “That greenhouse!”

Not everybody was enthusiastic and proud about the modern architectural feat of the Crystal Palace, built to house the show of the Great Exhibition of 1851; John Ruskin, leading Victorian art critic, hated it and called it a "Giant Greenhouse". It was also known as the great Shalimar (after gardens in Lahore, then India, so somewhat of a green house, after all!), and it was taken down after the exhibition to be built up somewhere else until it was burned down in 1936.

Preceding the palace is the Palm House at Kew, one of the few surviving glass Victorian buildings.

(https://www.kew.org/kew-gardens/attractions/palm-house)