Imagine the determination, effort and time it took master stone-cutters to create these complex interlocking Islamic symbols at Reales Alcázares de Sevilla. (Click image to view detail).
Did you know that even the artist, inventor and original thinker Leonardo da Vinci was plagued with self-doubt? He overcame such difficult moments through writing affirmations in a notebook. Among them: "Obstacles do not bend me." "Every obstacle is destroyed through rigor." And my personal favourite: "I shall continue."
If you get the chance to visit Château du Clos Lucé - the home in Amboise, France where da Vinci spent the last three years of his life - don't miss it! The chateau contains working models of many of da Vinci's inventions. And there's an underground tunnel leading directly to King Francis's Château d' Amboise, 500 metres away.