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Laser beams have revealed unknown construction , include the cadaver of a carnival that hosted horse - drawn chariot races , that were once part of a sprawlingRomancity hide in what is now northerly Spain .

Archaeologists announced their findings , which were part of a new pilot film program , July 17 , at a news conference . The researchers mapped the site of Iruña Veleia in what is now Álava , a responsibility in the Basque Country , using lidar ( light detecting and ranging ) , in which laser pulses are shine at the landscape painting from above and measured when they bounce back so as to see the terrain ’s surface , according to a translatedstatementfrom the Provincial Council of Álava .

An aerial lidar image of a Roman city

A lidar map of Iruña Veleia, a Roman-era city in Spain.

The novel aerial single-valued function reveal several structures spread out across the 620 - Accho ( 251 hectares ) site , include a 919 - foot - recollective ( 280 meters ) by 236 - foot - wide ( 72 one thousand ) papistic " carnival " field that seat 5,000 witness and host buck - drawn chariot races . This is only the third known Roman genus Circus site in the Iberian Peninsula .

Chariot racing was a pop pastime in ancient Rome . In fact , there was an entire industry focus on it . And much like esurient sports fan of today , partisan align with their favorite stables of horses and Auriga and would travel from near and far to chirk up them on , accord to theWorld chronicle Encyclopedia .

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In addition to the arena , Lidar also revealed arcade - trace street , housing districts , meeting spaces for adoration and buildings used for urban sanitisation and water supply .

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The urban heart is " a gem that is yet to be discovered , " according to the statement .

" The find is very important , and once again confirms that Iruña Veleia is a big ancient site , with great archeological and historical inquiry potency , " Ana del Val , deputy of Spain ’s Department of Culture and Sports , said in the financial statement .

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The investigator said they hope the situation " receive[s ] the attention it deserve , to protect it , to learn it , to give it value and to make wealth for the whole territorial dominion . "

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