Twice a year, a hatch in a busy Lisbon street opens to reveal steps leading to one of the Portuguese capital's most ancient sites: a 2,000-year-old Roman structure that still holds the buildings above it together. Dating back to the first century AD, the "cryptoportico" subterranean maze of tunnels and passageways was built by the Romans, who occupied the city then known as Olissipo beginning around 200 BC. The city remained under Roman control for several centuries. A tram passes by the entrance to the Roman galleries under downtown Lisbon, Portugal, April 20, 2023. REUTERS/Pedro Nunes "This structure guaranteed and, 2,000 years later, continues to guarantee that the buildings above our heads are stable and safe for those who live, work and walk up there," said Joana Sousa Monte...
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