The cornerstone for <a href="https://en.wikipedia.org/wiki/Tycho_Brahe" id="mwRA" rel="mw:WikiLink" title="Tycho Brahe">Tycho Brahe</a>'s <a href="https://en.wikipedia.org/wiki/Uraniborg" id="mwRQ" rel="mw:WikiLink" title="Uraniborg">Uraniborg</a> observatory is laid on the island of <a class="mw-redirect" href="https://en.wikipedia.org/wiki/Hven" id="mwRg" rel="mw:WikiLink" title="Hven">Hven</a>.