<Table> <Tr> <Th_colspan="2"> Circus Maximus </Th> </Tr> <Tr> <Td_colspan="2"> Modern (1978) view of the Circus site from the south - east </Td> </Tr> <Tr> <Th> Location </Th> <Td> Regio XI Circus Maximus </Td> </Tr> <Tr> <Th> Built in </Th> <Td> Old Kingdom era </Td> </Tr> <Tr> <Th> Type of structure </Th> <Td> Circus </Td> </Tr> <Tr> <Td_colspan="2"> Circus Maximus </Td> </Tr> </Table> <Tr> <Th_colspan="2"> Circus Maximus </Th> </Tr>

When was the circus maximus built in rome