You are looking at the HTML representation of the XML format.
HTML is good for debugging, but is unsuitable for application use.
Specify the format parameter to change the output format.
To see the non HTML representation of the XML format, set format=xml.
See the complete documentation, or API help for more information. 
<?xml version="1.0"?>
<api>
  <query-continue>
    <querypage qpoffset="10" />
  </query-continue>
  <query>
    <querypage name="Ancientpages">
      <results>
        <page value="20160524030816" timestamp="2016-05-24T03:08:16Z" ns="0" title="Main Page" />
        <page value="20170221203301" timestamp="2017-02-21T20:33:01Z" ns="0" title="Betiligte" />
        <page value="20170221203737" timestamp="2017-02-21T20:37:37Z" ns="0" title="Beteiligte" />
        <page value="20170221220704" timestamp="2017-02-21T22:07:04Z" ns="0" title="Juan de Rrada" />
        <page value="20170221220949" timestamp="2017-02-21T22:09:49Z" ns="0" title="Hauptseite" />
        <page value="20170221221033" timestamp="2017-02-21T22:10:33Z" ns="0" title="Autoren" />
        <page value="20170221221301" timestamp="2017-02-21T22:13:01Z" ns="0" title="Pedro Pizarro (Beteiligter)" />
        <page value="20170222210210" timestamp="2017-02-22T21:02:10Z" ns="0" title="Test" />
        <page value="20170222212238" timestamp="2017-02-22T21:22:38Z" ns="0" title="Diego de Almagro" />
        <page value="20171014142632" timestamp="2017-10-14T14:26:32Z" ns="0" title="Francisco de Carvajal" />
      </results>
    </querypage>
  </query>
</api>