Verulamium Park, adjacent to the Verulamium Museum, contains the usual—playground, wading pool, lake—and the unusual—Roman ruins that include part of the Roman town hall and a hypocaust, a central-heating system. The hypocaust dates to AD 200 and included one of the first heated floors in Britain. Brick columns supported the floor, and hot air from a nearby fire was drawn underneath the floor to keep bathers warm.
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