Cabernet’s roots are in Bordeaux (France), most notably the Medoc region. Here it is associated with world-famous Château names like Mouton-Rothschild, Marguax, and Haut-Brion. These wines are often prohibitively expensive and for "everyday" drinking look for the lesser Cru Bourgeois or regions like Entre des Mers again. And yes, you need to know the regions, as the grape is not shown on the label. More progressive producers in the Languedoc are using grape names on the labels, and bottling good value-priced wines at the same time.

Cabernet is grown pretty well everywhere as well. You’ll find the grape name on the label of wines from the United States, Australia, Spain, Italy, Canada, South Africa, Chile, and Eastern Europe. The U.S. -- in particular the Napa Valley  -- can produce Cabernet that can equal their French counterparts in many ways, including price.

What should Cabernet Sauvignon smell like in the glass?

The Old World style (e.g. Bordeaux) has aromas of bblackcurrant (cassis), plum, green pepper, mint, cedar, and tobacco (cigar-box)

The New World style (e.g. Napa) is more ripe or jammy blackcurrant, big oak, and eucalyptus