i'd do 1 or 2
Spoiler:

<dl class="gallery-item"><dt class="gallery-icon"> </dt></dl>
<dl class="gallery-item">2
<dt class="gallery-icon"> </dt></dl>
<dl class="gallery-item">3
<dt class="gallery-icon"> </dt></dl>
<dl class="gallery-item">4
<dt class="gallery-icon"> </dt></dl>
<dl class="gallery-item">5
<dt class="gallery-icon"> </dt></dl>
<dl class="gallery-item">6
<dt class="gallery-icon"> </dt></dl>
<dl class="gallery-item">7
<dt class="gallery-icon"> </dt></dl>
<dl class="gallery-item">8
<dt class="gallery-icon"> </dt></dl>
<dl class="gallery-item">9
<dt class="gallery-icon"> </dt></dl>
<dl class="gallery-item">10
<dt class="gallery-icon"> </dt></dl>
<dl class="gallery-item">11
<dt class="gallery-icon"> </dt></dl>
<dl class="gallery-item">12
<dt class="gallery-icon"> </dt></dl>
<dl class="gallery-item">13
<dt class="gallery-icon"> </dt></dl>
<dl class="gallery-item">14
<dt class="gallery-icon"> </dt></dl>
<dl class="gallery-item">15
<dt class="gallery-icon"> </dt></dl>
<dl class="gallery-item">16
<dt class="gallery-icon"> </dt></dl>
<dl class="gallery-item">17
<dt class="gallery-icon"> </dt></dl>