Mysterious Inca accounting and mathematics

For 350 years, Schonbrunn Palace was the main Summer residence of Austria's imperial family, the Habsburgs. Designed in a rococo style, the 1,441 rooms have played host to some of Europe's most influential figures including Marie Antoinette, Mozart and Napoleon Bonaparte. Schonbrunn was home to two of the great Habsburgs matriarchs, Empresses Maria Theresa and Elisabeth. Maria Theresa ruled for 40 years in the 18th century and married her daughters into some of the most powerful royal houses across Europe. Empress Elisabeth, known affectionately across the Austrian Empire as Sisi, has often been compared to Princess Diana because of her beauty and iconic status. She was assassinated in Geneva in 1898. The palace is located in a 500 acre park which includes an orangery, palm house and one of Europe's oldest zoos.

From iconic cultural contributions, to life-saving game-changers in science and medicine, France has been a major contributor in shaping our modern world. France gave us tools that allowed us to explore unimaginable places and helped perfect the finer things in life. We all owe France a toast to the wonderful world we live in. To celebrate these great contributions, we're going to run a thought experiment and strip them all away, leaving the world in crisis.

Albert Lin travels to the famous Machu Picchu, where LiDAR technology reveals evidence of an even older civilisation's involvement.