Chances are, you didn't even know that Subway served a pizza sub. But they do — on their secret menu, not their regular one. However, if you do get a blank stare when you request the pizza sub ...

I remember the first Subway that opened in my ... it weirdly reminded me of a cross between pizza and a hamburger. It’s a satisfying, flavorful warm sub and I was surprised to rank it in third ...

Narrator: With more than 42,000 restaurants in over 100 countries, Subway has the most locations of any fast-food chain on the planet. And at first, that sounds like a sign of a thriving sub giant.