Hypocaust
A hypocaust is a hollow space under the floor of an ancient Roman building. Hot air was sent into it for heating a room or bath.
Hypocaust Media
Hypocaust under the floor in a Roman villa in Vieux-la-Romaine, near Caen, France
Ruins of the hypocaust under the floor of a Roman villa at La Olmeda, Province of Palencia (Castile and León, Spain)
Caldarium from the Roman Baths at Bath, in Britain. The floor has been removed to reveal the empty spaces through which the hot air would flow.
Hypocaust at Chesters Roman Fort
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