At least 81 people are killed in the most devastating <a href="https://en.wikipedia.org/wiki/1957_Valencia_flood" id="mw5g" rel="mw:WikiLink" title="1957 Valencia flood">flood</a> in the history of the Spanish city of <a href="https://en.wikipedia.org/wiki/Valencia" id="mw5w" rel="mw:WikiLink" title="Valencia">Valencia</a>.