Quarrel Castle

Quarrel Castle is the home of Selwyn and Tallulah, their pet gargoyle Tharp, and the ghost Uncle Fenwick. It is so named because it is where the married couple always argue with each other. In the episode "Memory Melons", the castle was nearly destroyed when the couple's marital spats became so powerful that they created a storm that would have consumed the entire Smurf Forest. Fortunately, when Selwyn and Tallulah finally came to their senses and used their power together to make the storm cease, they also restored the castle.

Empath: The Luckiest Smurf stories
In the EMPATH: The Luckiest Smurf story series, the castle remained in existence until Selwyn and Tallulah decided to journey to another world to live out the rest of their lives before they pass away, taking the castle and everything in it with them along the journey.