I seldom read fiction so the best "series" would be
something non-fictional like the Time-Life Series on WWII,
The Old West, Ancient Empires etc.
I enjoy the genre of books that focus on one
subject and follow it throughout history. Kurlansky
has done this with each of his Salt, Paper and Cod books.
Ennos recently released "The Age of Wood - Our Most Useful
Material and the Construction of Civilization".
Such books reveal fascinating tidbits. For example,
some of England's woodland extant today was originally
planted as a means to sustain their (extinct) wooden shipbuilding
industry. The first modern steam powered machine tool
was made for the purpose of automating production
of wooden block and tack gear for Royal Navy ships during
the Napoleonic era. This machinery remained in service
until the 1960's!
Portsmouth Block Mills