One of Baring-Gould's more influential pieces of work was in a very different field: his book on werewolves was one of Bram Stoker's major sources for "Dracula" and played a key role in starting the whole modern horror genre. (A first edition of that book is fantastically rare and VERY expensive - no dealer has one in stock, you'll have to trawl for book auctions).

He also wrote a very good travel guide to the French Riviera, based on a lifetime's experience (he grew up in France). Better than what H.V. Morton did a few decades later.