People often talk about handbuilt bicycles, but that is a loosely defined term.  Here is a video of bicycles that are truly handbuilt, in the U.S., in the Midwest, in Wisconsin.  The amount of hand work that goes into these Trek Bicycles anchors the scale for hand built.  But it also takes a huge investment in machinery to raise all that hand work to a precisely made and performing bicycle.  Here is a 3 minute video that shows you the carbon fiber cutting, layup, and molding that wouldn't see if you if you took a factory tour.