For nearly 2,000 years, a huge Roman structure lay hidden beneath Budapest. Now archaeologists have uncovered the remains but they’re still trying to work out exactly what it was built for.
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Dating back to the 3rd or 4th century AD, the building stretches for hundreds of metres and ends in a mysterious polygonal tower. It appears to have been an important public building linked to the Roman military, but due to its thin walls it's unlikely to be a fortress, and it doesn’t appear on any surviving maps.
