Answer: crownjewels

AnswerCrossword Clue
CROWNJEWELS

Oliver Cromwell tried to melt them down

CROWNJEWELS

Palace display

CROWNJEWELS

Tower of London treasure

CROWNJEWELS
Part of Elizabeth II's fortune
CROWNJEWELS
Tower of London attraction
CROWNJEWELSPalace display, maybe
CROWNJEWELSTower of London treasures