Archaeologists working with London's Crossrail project have uncovered 20 skulls believed to be from the Roman period.
It is likely the bones were washed from a nearby burial site along one of London's "lost" rivers - the Walbrook.
Since the Crossrail project began, about 10,000 Roman items have been discovered.
These latest finds could give new insights into the lives of Roman people.
Near-intact pottery artefacts were also found which probably travelled along the same route as the skulls. Other bone fragments would not have been washed as easily down the river.