It's the 20th year of Royal Greenwich as a UNESCO World Heritage site and International Day for Monuments and Sites. This year the theme is “Cultural Heritage & Sustainable Tourism”, about getting the balance between tourism and world heritage sites. I hope Greenwich learn from past experiences in Dubrovnik and Split, Croatia. One resident of Split is quoted to have said 'This isn't a place to live any more, it's a tourist destination'. In Dubrovnik, thousands of people visit the walled city to the point the harbour was collapsing and the entrances were blocked by the literally thousands of visitors from the massif cruise ships. Stonehenge is a World heritage site. They are in a position to hold English Heritage to account.