Add the tags to create an ordered list in an unordered list.

<html>
 <body>
  <ul>
   <li>Travel Destinations
    <ol>
     <li>New York</li> 
     <li>Hawaii</li>
     <li>Rome</li>
    </ol>
   </li>
  </ul>
 </body>
</html>]]>

Add the <ul> tag and the <ol> tag. Then close the lists with </ol> and </ul>.