grave
The word 'grave' in Italian is 'tomba'. It is a noun that refers to a place where a dead person is buried. It can also refer to a memorial or monument erected over a grave. In Italian, 'tomba' is a feminine noun, so it is used with feminine articles and adjectives.
The Egyptian tomb is very ancient.
This sentence implies the old age or historical nature of an Egyptian tomb. This could be said while discussing history or visiting a museum.
I visited Dante's tomb in Ravenna.
This sentence would be said by someone who has recently visited Dante's tomb in Ravenna, possibly while discussing their travels through Italy.
I don't want to end up in an unmarked grave.
This is more serious and somewhat morbid, with the speaker expressing a fear or resistance towards the idea of dying without some form of recognition or remembrance.