History podcasts with enormous back catalogues

Hardcore History

Dan Carlin

Episodes are five or six hours. Blueprint for Armageddon is the one to start with.

Revolutions

Mike Duncan

Fall of Civilizations

Paul Cooper

Beautifully produced. Put it on during a long walk and nothing else.

You're Dead to Me

Greg Jenner

A historian plus a comedian each episode. Good one for teenagers.

Stuff You Missed in History Class

iHeartRadio en.wikipedia.org

The History of Rome

Mike Duncan

The audio quality in early episodes is rough. Stick with it past Romulus.

The Rest Is History

Tom Holland and Dominic Sandbrook

The History of English Podcast

Kevin Stroud