Simply give an id of showcity to the div element, then use :target pseudo-class to make it visible:
<div id="showcity" class="city">Some city</div>
.city:target {
  display: block;
}
6.6.2. The target pseudo-class :target
Some URIs refer to a location within a resource. This kind of URI ends
  with a "number sign" (#) followed by an anchor identifier (called the
  fragment identifier).
URIs with fragment identifiers link to a certain element within the
  document, known as the target element. For instance, here is a URI
  pointing to an anchor named section_2 in an HTML document:
http://example.com/html/top.html#section_2
A target element can be represented by the :target pseudo-class. If
  the document's URI has no fragment identifier, then the document has
  no target element.
It's worth noting that :target is supported in IE9+.