divを隣でなく下に表示させる方法は？

#map { float:left; width:700px; height:500px; }
#list { float:left; width:200px; background:#eee; list-style:none; padding:0; }
#similar { float:left; width:200px; background:#000; } 

<div id="map">Lorem Ipsum</div>        
<ul id="list"><li>Dolor</li></li>Sit</li><li>Amet</li></ul>
<div id ="similar">
    this text should be below, not next to ul.
</div>

#map {
    float: left; 
    width: 700px; 
    height: 500px;
}
#wrapper {
    float: left;
    width: 200px;
}
#list {
    background: #eee;
    list-style: none; 
    padding: 0; 
}
#similar {
    background: #000; 
}

<div id="map">Lorem Ipsum</div>        
<div id="wrapper">
  <ul id="list"><li>Dolor</li><li>Sit</li><li>Amet</li></ul>
  <div id ="similar">
    this text should be below, not next to ul.
  </div>
</div>