This week on The Travel Detective, some of America’s most patriotic songs that so many of us grew up singing actually have a hidden history. We went across America in search of their true meaning, and we’ll face the music. That’s our cover story. Plus, fasten your seatbelts for the most innovative and fun airline safety videos. And then, we’ll dive in to some of the world’s most over the top underwater hotels. All this and more on the next edition of The Travel Detective. Check your local PBS listings.