Colosseum
The Colosseum-An Icon exhibition sheds light on the lesser-known history of the heritage site Julian Finney/Getty Images

The Colosseum is best known as the legendary Roman amphitheatre where gruesome blood sport thrived and gladiators became legends from the Flavian dynasty to the 6th century AD following which it was repurposed for housing, shops and a quarry. Archaeologists have now opened a new exhibition of unpublished findings from recent studies that unveil a hidden history to the heritage site.

According to the findings, around the 12th century, the Colosseum housed a fortress built by the Frangipane family. During a two-year restoration project, researchers discovered holes carved into the travertine stone of the top tier of the structure which indicated that a raised wooden walkway was built to serve as a lookout for the baronial family's soldiers.

The site was also most probably used as an aristocratic residence in the medieval times, going by various other finds including part of a ram's head and carved antlers which were used to decorate the rooms.

"Millions of tourists come here each year to learn about the Roman period but they have little idea of how the Colosseum was used during the medieval era," Riccardo Santangeli Valenzani, one of the curators of the new exhibition said, according to The Telegraph.

Rossella Rea, the Colosseum's director explained that the fortress collapsed during an earthquake in 1349.

By the 1600s, the Italian heritage site was left in disrepair and was taken over by nature. The micro-climate enabled more than 400 species of plants to flourish inside its arched walls and created a wild botanical garden of sorts.

"What it shows is the extraordinary capacity the Colosseum has had to assume different identities over the centuries," said Francesco Prosperetti, one of the officials in charge.

The Colosseum – An Icon exhibition, which is being housed at the heritage site itself, will be open to visitors in January 2018 and will show the various changes made to the building since its original construction and the major influence it went on to have in the field of architecture.

Ancient Rome
A picture shows an ancient map of Rome during a press preview of the exhibition The Colosseum- An Icon on March 6, 2017 at the Colosseum in Rome TIZIANA FABI/AFP/Getty Images