It sounds like Pillars of the Earth, by Ken Follett. There is a sequel called World Without End.
He's also done The Century Trilogy which is a similar format spanning generations in later centuries.
The genre is historical fiction.
Visit the thread we have going right now about historical fiction/novels.
Historical Novels, Anyone?
There's also a thread going on in the History forum.
Great Historical Fiction.
Also, if you do a search for historical fiction via the C-D search function you'll get lots of hits.
Have fun and so glad you like this genre.