an unsolved murder
...that Scotland Yard, one of the world's most iconic police institutions, was built overtop the site of an unsolved murder?
...that <a href="./Scotland_Yard" id="mwBf4" rel="mw:WikiLink" title="Scotland Yard">Scotland Yard</a>, one of the world's most iconic police institutions, was built overtop  the site of <b id="mwBf8"><a class="mw-redirect" href="./The_Whitehall_Mystery" id="mwBgA" rel="mw:WikiLink" title="The Whitehall Mystery">an unsolved murder</a></b>?