What does this dream mean? Recurring dream about a house...?

I have had recurring dream about a huge house for over 20 years. It has been in many different places, in the middle of cities, countrysides, places I've lived or traveled a lot through. There are many bedrooms on several stories, halls that seem to never end. Sometimes it's a house that I've lived in before but much larger. Sometimes I live there or have lived there, but it's always a house that I'm finding new discoveries but seems so familiar to me. I feel like its always the same house. My grandma used to have the same recurring dream. What do you think?