archaeological
Walls of Jericho
Walls that fell 'flat' outward.

Scripture Reference: Joshua 6:20
"When the trumpets sounded, the army shouted, and at the sound of the trumpet, when the men gave a loud shout, the wall collapsed; so everyone charged straight in, and they took the city."
The Evidence
Excavations at Tell es-Sultan (ancient Jericho) reveal that the mudbrick walls collapsed *outward* and formed a ramp against the retaining wall, allowing the Israelites to charge 'straight in'.
Historical Context
Archaeologist Kathleen Kenyon found the fallen walls. The city was also burned (Joshua 6:24) but the grain stores were left untouched (short siege), exactly as the Bible says.