Journey To The Heart of Castlevania
Via Press the Buttons, a website entitled The Castlevania Dungeon. Everything you could want to know about the Belmonts and their quest against undead ickyness is detailed here, with extensive plot details and screenshots. The site also has several features, including details on who made the games, magazine scans from previews and reviews, and Simon Belmont on Captain N.
This site has been around for at least 6-7 years.
In Soviet America the banks rob you!
One of the coolest things about this site for me is the soundtrack stuff it has. Castlevania has had some awesome music, and even more awesome albums of it. I found this site a couple years ago and would HIGHLY recommend the Dracula New Classic, Dracula Battle Perfect Selection, and Dracula Battle 2 Perfect Selection albums. Some of the best video game music albums ever. Not to mention there's no way in Hell most people will hear Dracula New Classic if they don't get it from this site - last time I looked, it went for around $200 on ebay!
IIRC Castlevania Bloodlines (Genesis) was set in the early 20th Century (World War I era). There was a level where you went through a German factory and had to defeat skeletons that were wearing army helmets. There was also a level that was cut out of the final version that featured a German dirigible in the background.