I just love the British Library (though I prefer the old one with the museum, with the old reading room).
Now they have collected famous love letters in this book Love Letters 2000 Years of Romance.
And The Daily Beast excerpts a good variety in this essay, 'Love Letters' Anthologizes 2,000 Years of Passion Put to Paper. Love letters may be becoming extinct, but I still write them. I love them.
These excerpts are fascinating to read as a reminder that love, longing, pain, jealousy remains the same whether now or 2,000 years ago. The human condition remains.