Secret Roman City under Lisbon
In 1755, Portugal had a terrible earthquake. When workers in Lisbon were cleaning up from the disaster, they discovered remnants of an old Roman village buried beneath the city. They climbed down into the hole and found stone passageways, rooms, chambers and bridges that are two thousand years old.
It is believed that these old passageways are from the time when Agustus ruled Rome, which was from the 1st century BC and the 1st century AD.
Today, the entrance to this underground world is through a hole in the street on Rua da Prata. During many times of the year, the ruins are closed because they are flooded. After city workers clean up the mess from the flood, the ruins are open to the public…but only for a few days.