<human>:  When was the Crystal Palace built?
<bot>: The Crystal Palace was built in Hyde Park in London in 1851. It was built to house the Great Exhibition, a world fair that showcased many new inventions. The Crystal Palace was a huge glass structure, which was made up of 1,684,000 panes of glass, each about four feet tall. The roof was supported by iron columns, and the building was heated by steam engines.