The Palace Of Mystery: Quinta Da Regaleira, Portugal. That would be cool if we had a locked up "Rapunzel" tower that you had to find the secret passage to get to.
17 Fairytale Castles You Must Visit In England - Travel, Travel Inspiration - England, Europe, United Kingdom -
Bodiam Castle, East Sussex, England, UK - a moated castle. It was built in 1385 by Sir Edward Dalyngrigge.
Garden tunnel, Alnwick Castle, Northumberland, England - A tunnel in the back yard! This would be fun! Be sure to check out the Poison Garden