Once you upon a time your US passport was the most powerful travel document in the world. Now things are a bit different. For example which of the following countries do you think require a visa for US citizens?
If you answered all 8 of them, good for you! I knew about half of these counties, the reason I wanted to take a look was because sometimes I see flight sales and then when I realize I need a visa then my plans never start! To make sure the information you are getting is correct, I would suggest heading to the State Department’s website and searching for your dentition.