cenotaph (SEN-uh-taf, SEN-uh-tahf) - n., a monument erected in honor of a person or group of persons whose remains are elsewhere.
Such as, most publicly in modern times, honoring those who died in war -- in ancient times, they were also common for individuals, such as those lost while traveling. Used since the 1570s, taken from French cénotaphe, from Latin cenotaphium, from Ancient Greek kenotaphion, from kenos, empty + taphos, tomb. Here's one outside Whitehall, London, originally for the British who died in WWI, since expanded to include each successive war:

Thanks, WikiMedia!
---L.
Such as, most publicly in modern times, honoring those who died in war -- in ancient times, they were also common for individuals, such as those lost while traveling. Used since the 1570s, taken from French cénotaphe, from Latin cenotaphium, from Ancient Greek kenotaphion, from kenos, empty + taphos, tomb. Here's one outside Whitehall, London, originally for the British who died in WWI, since expanded to include each successive war:
Thanks, WikiMedia!
---L.