Madonna owns various homes in England, the United States and Portugal, and a new video shared by the star has given fans a first look at the outdoor swimming pool at one of her properties.SEE: Inside Madonna's £10million London mansionThe Madame X star filmed her daughters Stelle and Estere in the space as they showed off their swimming skills, and inadvertently revealed the design in the process.WATCH: Madonna shows off jaw-dropping private swimming poolIt's built with natural concrete tiles at