The <a href="https://en.wikipedia.org/wiki/Barnette%E2%80%93Bos%C3%A1k%E2%80%93Lederberg_graph" class="extiw" title="en:Barnette–Bosák–Lederberg graph">Barnette–Bosák–Lederberg graph</a>, the smallest known non-Hamiltonian cubic polyhedral graph
<a href="//commons.wikimedia.org/wiki/User:David_Eppstein" class="mw-redirect" title="User:David Eppstein">David Eppstein</a>
<span class="int-own-work" lang="en">Own work</span>