Buckingham Palace is the official residence of the queen. Built in 1705, it's size was doubled. Now in a life after people, the queen is nowhere to be found, and nature takes her throne. After people, Queen Elizabeth's corgis are now trapped inside her magnificent home.2 weeks after people : The corgis make their way to the kitchens, and start to eat the food there. They survive by drinking toilet water.
3 months after people : The food supply is gone and the corgis break out, as Buckingham Palace is invaded by nature.
100 years after people : The Buckingham Palace is surrounded completely by greenery.
5,000 years after people: The greenery currently holds the building together, thanks to the roots and tree-trunks, it has grown and filled every nook and cranny of the palace and has become it's own scaffolding, , this building could very well last forever, perhaps to the point of becoming an ancient-Greek like structure.