I did a marathon with Pompeii
I also did it with Volcano, and Dante's Peak titled When Great Volcanos Emerge. You guys can check it out on my blog.
http://mrbrownsmoviemarathons.blogspot.com/2016/03/when-great-volcanos-erupt.html
I thought Pompeii was a fun guilty pleasure movie with the greatest attraction of the film being the Volcano itself. Sure the storyline isn't as strong as it could be as this could've been an epic film with a Titanic like romance before the great disaster but it works in the context of the marathon with Dantes Peak and Volcano forsure. Pompeii is mentioned in Dantes Peak by one of the scientists making the marathon feel like a great volcano trio.