Vestige
/ˈvɛ.stɪd͡ʒ/
noun
The mark of the foot left on the earth.
(by extension) A faint mark or visible sign left by something which is lost, or has perished, or is no longer present.
“the vestiges of ancient magnificence in Palmyra”
A vestigial organ; a non-functional organ or body part that was once functional in an evolutionary ancestor.