I agree with Amber, the second part of the first chapter is pretty interesting.  I guess what struck me was verse 20, that lets us know that it is evident that God is real, just by seeing what He has made.

20For ^(AM)since the creation of the world His invisible attributes, His eternal power and divine nature, have been clearly seen, ^(AN)being understood through what has been made, so that they are without excuse.

The other thing I thought was interesting was verse 22 through the end of the chapter.  

22^(AP)Professing to be wise, they became fools,

 23and ^(AQ)exchanged the glory of the incorruptible God for an image in the form of corruptible man and of birds and four-footed animals and ^[d]crawling creatures.

 24Therefore ^(AR)God gave them over in the lusts of their hearts to impurity, so that their bodies would be^(AS)dishonored among them.

 25For they exchanged the truth of God for a ^(AT)lie, and worshiped and served the creature rather than the Creator,^(AU)who is blessed forever. Amen.

It continues to say all the bad things that are going on.  This interested me because it sounds so similar to what is going on in our world today.  People today are always saying how things are so bad right now and it is such a tough world to live in.  While I don't disagree with that, it has been that way forever...these verses tell us things and people were bad back then, too.  Many people don't feel the Bible is applicable in today's world, or that parts are and parts aren't.  When I read Romans 1, I see that things weren't all that different back then, and that makes me feel that the Bible and its teachings are just as applicable today as they were then.