Another one that I've been kicking around...
Steampunk/Victorian high adventure/proto-pulp/Wold Newton, with some conspiracy and alt-history thrown in.
1895. The heroes are adventurers and explorers based in the Kingdom of Ruritania. They are gradually drawn into a war which has secretly spanned the last century...and which now explodes into open conflict.
Almost one hundred years before, a meteor landed near Wold Newton, England. No one realized it at the time, but some property of the meteorite --- something Victorian science cannot begin to understand --- affected the bloodlines of the people nearby. Their descendants would have the potential for nearly superhuman physical, mental, and spiritual abilities. From this blood would come a century's greatest heroes...and most dangerous villains...
[Anyway...plenty of swashbuckling, Freemasons v. Seven Hidden Masters v. Hanoi Xan v. Moriarty, weird science aplenty, the quest for immortality, mystical rites, and Lost Kingdoms. For the finale: the Martians in tripod walkers want the meteorite back...]