If you are reading "The Three Musketeers" by Dumas, do not forget that it is only the beginning! "Twenty Years After" follows, then "The Vicomte de Bragelonne" (which is often split into smaller parts, in English usually "The Vicomte de Bragelonne", "Louise de la Vallière" and ending with "The Man in the Iron Mask"). Great stuff...
"The Call of Cthulhu" may be his most famous. I have also read "Nyarlathotep" and found it enjoyable. I have to limit my dosage of Lovecraft though, due to sometimes disturbing dreams.... ;-)
