Remains to be seen?

RUINS

Think of what’s left behind after a once-great structure crumbles—this word can also describe the remnants of something destroyed by time or disaster.

This clue plays on the double meaning of "remains." On the surface, it suggests something yet to be revealed ("remains to be seen"), but "remains" also refers to the leftover parts of something destroyed—like ancient ruins. The question mark signals wordplay, hinting you should think beyond the obvious. So "ruins" fits as both the literal remnants of a structure and a pun on what "remains."