Lupin III: Cagliostro no Shiro, Layton Kyouju to Eien no Utahime Recommendations
A lot of the same themes: crests, ancient mysteries, puzzles, enormous castles, and masked villains.
Both anime feature a main protagonist who is seeking to solve an ancient puzzle. Also, both deal with kingdoms, castles, traps and shady villains. However, both are light-hearted anime and do not take themselves too seriously, opting instead to entertain the watchers.