What Are These Two Circles in Cuba? | What on Earth?

Visible from space over Cuba are two, huge circles of unidentified structures. Perhaps they were constructed to honor the underground, ritualistic religion Santeria. Or are they, as some fear, numbers stations, transmitting instructions to a network of spies in America? Stream Full Episodes of What on Earth?: https://www.sciencechannel.com/tv-shows/what-on-earth/ Subscribe to Science Channel: http://bit.ly/SubscribeScience Like us on Facebook: https://www.facebook.com/ScienceChannel Follow us on Twitter: https://twitter.com/ScienceChannel Follow us on Instagram: https://www.instagram.com/ScienceChannel/