Rome's new Colosseum metro station with archaeological displays opens to tourists

Beyond the entrance of Rome's newest metro station under the Colosseum, there are display cases filled with hundreds of ancient artefacts found during a decade-long construction project.

Spread out over four levels to a depth of 32 metres in the heart of Rome, the "Colosseo-Fori Imperiali" station on the city's C-line unveiled on Tuesday is a feat of modern engineering.

For the price of a 1.5-euro ticket, travellers can access the station's underground museum holding 350 objects -- from ceramic jugs and lamps to bronze statuettes and a wooden sword.

A little further, the remains of a bathhouse of the home of a wealthy Roman can be seen.

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Ancient Rome was built in layers. Temples and forums were built on older foundations before themselves being covered over, creating a fascinating terrain for archaeologists.

At ground level, a triangular opening even offers an unusual viewpoint on the Colosseum.

"The most important thing that we have managed to do is to show an insight... into daily life," Elisa Cella, an archaeologist at the Colosseum archaeological park, said at the presentation.

Extraordinary past

Rome mayor Roberto Gualtieri called the station opening "an extraordinary and historic event".

He also defended the costly and lengthy works, which have caused widespread disruption for residents and tourists in the area for years.

The project had to be delayed several times due to complaints and unexpected discoveries.

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"These archaeological digs and finds, are not an obstacle," he said, calling them an opportunity to reveal the city's "extraordinary past".

Faced with the unique geological complexity of Rome, the excavation adopted a method of "descending archaeology" specifically developed for underground stations in the historic centre.

It involves installing intermediate slabs as excavations progress from top to bottom, thereby ensuring the stability of the structures.

Also inaugurated on Tuesday was the Porta Metronia station -- where excavations revealed a vast military complex from the 2nd century AD including a residence decorated with frescoes and mosaics.

The residence was dismantled, restored and then reinstalled in a space which metro travellers can admire from an elevated walkway.

"Rome has always built on top of itself," said Simona Morretta, head of excavations and of the Porta Metronia museum.

Launched in 2007, the construction of the C line connecting the city's northeast to the southeast has suffered significant delays.

Once completed, it will have 31 stations over a length of 29 kilometres.