The remains of a Roman mausoleum have been discovered in south London, and researchers believe it’s the most intact mausoleum of that type ever discovered in Britain, according to a report from BBC News.

The “incredibly rare” mausoleum was discovered by archaeologists from the Museum of London Archaeology (MOLA) at an excavation site called Liberty of Southwark. Researchers believe the mausoleum may have been a wealthy family tomb, as it was once an impressive building that was likely two stories high, The Guardian reported.

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“This relatively small site in Southwark is a microcosm for the changing fortunes of Roman London – from the early phase of the site where London expands and the area has lavishly decorated Roman buildings, all the way through to the later Roman period when the settlement shrinks and it becomes a more quiet space where people remember their dead,” Antonietta Lerz, a senior archaeologist at MOLA, said.

Read more: Daily Wire