Dublin Explorer - Malahide Castle. As a Southsider, born and raised, Dublin Explorer has opened my eyes to the remarkable amount of historic buildings and lands on Dublin's Northside. This was back in the days that 6 year old Isaac was keeping things real, we arrived 45 minutes late for our meeting with Alex Gibson, our man on the ground. When you have a building that's 800+ years old, you know you're going to be knee deep in stories. Fantastic place.