cenotaph
Definitions
A monument erected in honor of a person or group of people whose remains are elsewhere.
An empty tomb or a commemorative structure built to memorialize those buried in an unknown location.
Examples
The city erected a grand cenotaph in the town square to honor the soldiers who never returned from the war.
Visitors stood in silence before the empty cenotaph, paying their respects to those whose bodies were lost at sea.
Synonyms
memorial monument tomb shrine commemorative structure empty grave