JSFiddle - React, Tailwind, and code Playground

HTML

<div class="row">
    
    <div class="col-sm-4 col-md-3 col-lg-2 thumbnailcontainer">
    <div class="thumbnail">
      <img src="http://upload.wikimedia.org/wikipedia/commons/0/03/Mountain_Bluebird.jpg" alt="image">
      <div class="caption">
        <div class="thumbnailheader"><h3>Lorem ipsum</h3></div>
        <p>Lorem ipsum ad his scripta blandit partiendo.</p>
        <p><a href="#" class="btn btn-default center-block" role="button">Open</a></p>
      </div>
    </div>
    </div>
    
    <div class="col-sm-4 col-md-3 col-lg-2 thumbnailcontainer">    
    <div class="thumbnail">
      <div class="img-container">
        <img src="http://upload.wikimedia.org/wikipedia/commons/0/03/Mountain_Bluebird.jpg" alt="image" class="img-responsive center-block">
      </div>
      <div class="caption">
        <div class="thumbnailheader"><h3>Lorem ipsum.</h3></div>
        <p>Lorem ipsum ad his scripta blandit partiendo.</p>
        <p><a href="#" class="btn btn-default center-block" role="button">Open</a></p>
      </div>
    </div>
    </div>
        
    <div class="col-sm-4 col-md-3 col-lg-2 thumbnailcontainer">    
    <div class="thumbnail">
      <img src="http://upload.wikimedia.org/wikipedia/commons/8/84/Leaning_Tower_of_Pisa_(April_2012).jpg" alt="image" class="img-responsive center-block">
      <div class="caption">
        <div class="thumbnailheader"><h3>Lorem ipsum.</h3></div>
        <p>Lorem ipsum ad his scripta blandit partiendo.</p>
        <p><a href="#" class="btn btn-default center-block" role="button">Open</a></p>
      </div>
    </div>
    </div>
        
  </div>

CSS

@import url('http://maxcdn.bootstrapcdn.com/bootstrap/3.2.0/css/bootstrap.min.css');
@import url('http://maxcdn.bootstrapcdn.com/bootstrap/3.2.0/css/bootstrap-theme.min.css');

.thumbnailcontainer
{
    height: 40rem;    
    width: 20rem;
}

.img-container
{

}

img
{
	max-height: 100%;
	max-width: 100%;
	margin-left: auto;
	margin-right: auto;
}
.thumbnail img { height:100px; width:100%;}

JavaScript

(function($) {
    $.fn.uniformHeight = function() {
        var maxHeight   = 0,
            max         = Math.max;

        return this.each(function() {
            maxHeight = max(maxHeight, $(this).height());
        }).height(maxHeight);
    }
})(jQuery);
$(".thumbnailcontainer").find(".thumbnailcontainer").uniformHeight();