Bootstrap 3 - Aligning column height

Question

create a site for educational purposes but I\'m stuck with grid/column height issue.

Here\'s an image of site I\'m trying to replicate: Click me

Here\'s what I\'

Answer 1

Here is a snippet, but I can't realize why are so huge gaps between columns.

Although look at https://jsfiddle.net/xeen9s7y/ - it works well.

I've added border: solid 1px red; to images for better visual control.

img {
    width: 100%;
    height: 100%;
    border: solid 1px red;
}
.imgcont {
    height: 25vw;
    padding: 1px;
}
.imgcont2 {
    height: 50vw;
    padding: 1px;
}

<link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet"/>
      <section class="portfolio-content">
            <div class="row" id="port-first-row">
                <div class="col-xs-6" id="port-first-col">
                    <div class="row">
                        <div class="col-xs-12 imgcont">
                            <img src="//placehold.it/200x150/2255EE" alt="image"/>
                        </div> <!-- end col-12 -->
                        <div class="col-xs-12 imgcont">
                            <img src="//placehold.it/200x150/2255EE" alt="video" />
                        </div> <!-- end col-12 -->
                    </div> <!-- end row -->
                </div> <!-- end port-first-col -->

                <div class="col-xs-6 imgcont2" id="port-second-col">
                    <img src="//placehold.it/200x150/2255EE" alt="image" />
                </div> <!--end port-second-col -->
            </div> <!-- end port-first-row -->

            <div class="row" id="port2-second-row">
                <div class="col-xs-6 imgcont" id="port2-first-col">
                    <img src="//placehold.it/200x150/2255EE" alt="phuket" />
                </div> <!-- end col-sm-6 -->
                <div class="col-xs-6 imgcont" id="port2-second-col">
                    <img src="//placehold.it/200x150/2255EE" alt="julie" />
                </div> <!-- end col-sm-6 -->

            </div> <!-- end port-second-row -->
        </section> <!-- end portfolio-content -->