Ghosts on the streets of ancient Athens

An ancient Greek living quarter, next to what is now the Street of Dionysus. Could there be ghosts in these houses? The passage below is a ghost story as it was told by Pliny the Younger around 100 AD.

"I am extremely desirous therefore to know whether you [Sura] believe in the existence of ghosts, and that they have a real form, and are a sort of divinities, or only the visionary impressions of a terrified imagination.[...] There was at Athens a large and roomy house, which had a bad name, so that no one could live there. In the dead of the night a noise, resembling the clashing of iron, was frequently heard, which, if you listened more attentively, sounded like the rattling of chains, distant at first, but approaching nearer by degrees: immediately afterwards a spectre appeared in the form of an old man, of extremely emaciated and squalid appearance, with a long beard and dishevelled hair, rattling the chains on his feet and hands.[...]The noise increased and advanced nearer, till it seemed at the door, and at last in the chamber. He looked up, saw, and recognized the ghost exactly as it had been described to him: it stood before him, beckoning with the finger, like a person who calls another. Athenodorus in reply made a sign with his hand that it should wait a little, and threw his eyes again upon his papers; the ghost then rattled its chains over the head of the philosopher, who looked up upon this, and seeing it beckoning as before, immediately arose, and, light in hand, followed it. The ghost slowly stalked along, as if encumbered with its chains, and, turning into the area of the house, suddenly vanished. Athenodorus, being thus deserted, made a mark with some grass and leaves on the spot where the spirit left him. The next day he gave information to the magistrates, and advised them to order that spot to be dug up. This was accordingly done, and the skeleton of a man in chains was found there; for the body, having lain a considerable time in the ground"

Pliny the Younger - Letters VII.27
Translated by W. Melmoth