LOS ANGELES (AP) — Marc Maron drops the 1,686th and final episode of his “WTF” podcast Monday.

The show began with the comic and actor mainly interviewing stand-up comedians. Maron would go on to talk to legends of music and Hollywood, and a sitting president.

Here’s a look at seven essential episodes from the 16-year history of the pioneering longform interview podcast.

Robin Williams

“WTF” episode No. 67, April 26, 2010

Fairly famous names had come on Maron's podcast from its 2009 debut, but Robin Williams , the Oscar, Emmy and Grammy winner and luminary of the stand-up stage, was a huge get just seven months into the show. Maron made the most of it with an unforgettable interview that constantly shifted between comedy and tragedy. “Discussions of death,” Williams said after g

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