Mary do you subscribe to Audible? There is a made-for-Audible podcast called "The Bering". 8 part true story about a fishing boat that sank in the Bering Strait off of Alaska, and the riveting US Coast Guard rescue. There is a song at the end of every episode, "Moonsmoke" by a band called Caamp. Because of the podcast, we fell in love with the band, and went to see them live last weekend!
Widely available, and continuing on the USCG theme, there is a podcast called "They Had To Go Out", a series of interviews with retired Coasties during which the subject is asked to tell their "most daring, dangerous, or epic sea story or stories"- from enlisted folks to retired Admirals. I believe these interviews are being archived for the new USCG Museum, in fact. I love listening to people tell their career stories. The women are particularly inspirational.
I like listening to The Moth Radio Hour podcast, and Story Corps - again, people's personal stories.
Finally - and am just going to toss this out there and run - my (other, non-USCG) son introduced me to the British podcast "My Dad Wrote a Porno" and it's been a lot of fun to listen to on long walks. Yes, I'm the crazy person literally bent over laughing in the middle of the sidewalk.
"Serial" was the first podcast I ever really got interested in, too!