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JavaScript

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HTML 

              
                <!-- Images sourced from Wikimedia Commons http://commons.wikimedia.org/wiki/Main_page -->

<div class="imageGrid">
  <div class="tile" style="background-image: url('https://bit.ly/1tSEfja');">
    <div class="textWrapper"><h2>Pont de Bir-Hakeim, Paris</h2>
      <div class="content">The western part of the Pont de Bir-Hakeim seen at night. Buildings of the 16th arrondissement of Paris are visible in the background.</div>
    </div>
  </div><!--
--><div class="tile" style="background-image: url('https://bit.ly/1rXAWHn');">
  <div class="textWrapper"><h2>Wiesen Viaduct, Switzerland</h2>
    <div class="content">A RhB Ge 4/4 II with a push–pull train crosses the Wiesen Viaduct between Wiesen and Filisur, Switzerland.</div>
  </div>
  </div><!--
--><div class="tile" style="background-image: url('https://bit.ly/1k3JsEi');">
  <div class="textWrapper"><h2>Office building, Germany</h2>
    <div class="content">Office building of the LVM Insurance in Munster (Westphalia), Germany.</div>
  </div>
  </div><!--
--><div class="tile" style="background-image: url('https://bit.ly/Ux98xe');">
  <div class="textWrapper"><h2>Maya Beach, Thailand</h2>
    <div class="content">Long-tail boats in Maya Beach, Ko Phi Phi Lee, Thailand.</div>
  </div>
  </div><!--
--><div class="tile" style="background-image: url('https://bit.ly/1nR24qx');">
  <div class="textWrapper"><h2>Chi Minh City, Vietnam.</h2>
    <div class="content">Night view of Ho Chi Minh City from Bitexco Financial Tower, Vietnam.</div>
  </div>
  </div><!--
--><div class="tile" style="background-image: url('https://bit.ly/1oAM0tK');">
  <div class="textWrapper"><h2>Porto City Hall, Portugal</h2>
    <div class="content"></div>
  </div>
  </div>
  
  
  
</div>
!

CSS 

              
                

.imageGrid {
  line-height: 0;
}
.imageGrid .tile {
  width:33.33%;
  min-height:20em;
  line-height: 1.2;
  display:inline-block;
  background-size: cover;
  background-position: center center;
  background-repeat: no-repeat;
  overflow: hidden;
  position: relative;
  
  color:#fff;
  font-family:"Verdana",sans-serif;
  text-shadow: 2px 2px 2px #000;
  cursor: pointer; 
  cursor: hand;
}

.imageGrid .tile:before {
  content: '';
  background-color: rgba(15,15,15,0.5);
  display: block;
  width: 100%;
  height: 100%;
  z-index: 0;
  position: absolute;
}

.imageGrid .tile:hover:before {
  display: none;
}

.imageGrid .tile .textWrapper {
  text-align: center;
  vertical-align: middle;
  width: 80%;
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  font-size: .75em;
}

.imageGrid .tile .textWrapper .content {
  display: none;
}

.imageGrid .tile:hover .textWrapper .content {
  display: block;
}

.imageGrid .tile:hover .textWrapper .content h2 {
  margin: 0;
}

@media (max-width: 1000px) {
  .imageGrid .tile {
    width: 50%;
  }
}
 
@media (max-width: 700px) {
  .imageGrid .tile {
    width: 100%;
  }
  
}
!

JS
!
999px

Console