If you have an indoor swimming pool, you're probably pretty rich. ✬

My grandparents didn't have indoor plumbing. ✬

This is an indoor cat. ✬

Tom's cat is an indoor cat. ✬

This is designed for indoor use. ✬

This hotel has an indoor pool. ✬

When was the last time that you swam in an indoor pool? ✬

This hotel has one indoor swimming pool and two outdoor swimming pools. ✬