Windsor Castle's Secrets

The British crown jewels were kept in a biscuit tin and stored in a chamber under Windsor Castle during WWII. During renovations, they just covered it at night with a tarp to prevent German airplanes from spying on it. Notably, not even then-Princess Elizabeth was told about it. Furthermore, the modern length of a marathon, which is 26.2 miles, was established in 20th-century London as the distance between Windsor Castle and the Olympic Stadium, after which the marathon became an official Olympic event. Prior to this, marathon distances were arbitrary and varied by several miles.