What if World Heritage Sites are not just places to visit, but messages from humanity’s past and future? Introduction by Carl SaganA World Heritage Site is more than a famous place.It is a signal across time.A mountain city above the clouds.A pyramid under the desert sun.A temple swallowed by jungle.A city carved into rose-red cliffs.A reef glowing beneath … [Read more...] about Top 20 World Heritage Sites and the Future of Humanity