The Torah names two cities: Pithom and Ra'amses. The Targum Pseudo-Jonathan on Exodus (1:11) names two others: Tanis and Pelusium.
"And they set over them work-masters to afflict them in their servitude; and they builded walled cities to become Pharoh's treasure-places, Tanis and Pilusin."
This identification is not a random aside. Tanis (Egyptian Djanet) sat in the northeastern Delta, a major administrative hub. Pelusium guarded the easternmost gate of Mizraim, the military checkpoint for anyone entering from the direction of Canaan. In other words, the Targum is saying that Hebrew hands built the walls that locked Hebrew bodies inside.
That is the deepest grief of slavery. The tools of your own confinement are shaped by your own calluses. Every brick the Israelites baked was another brick between them and the border.
And Pharaoh's word for these cities is the word the Targum uses with pointed care — treasure-places. Egypt sees Israel's labor as deposits in a vault. Every hour of exhausted work becomes grain, becomes gold, becomes empire. The afflicted body is an economy to the one afflicting it.
The sages reading this noticed something else. Pithom and Ra'amses collapsed. Tanis and Pelusium fell. Mizraim's treasure-cities are now archaeological sites. But the people who built them are still here, still telling the story on Pesach. The walls built to contain them turned to dust. The Haggadah did not.