Perpendicular Gothic architecture, Palace of Westminster.
<a href="//commons.wikimedia.org/wiki/User:RedCoat" title="User:RedCoat">RedCoat</a> (<a href="https://en.wikipedia.org/wiki/User:RedCoat10" class="extiw" title="en:User:RedCoat10">en:User:RedCoat10</a>)
CC BY-SA 3.0
<span class="int-own-work" lang="en">Own work</span>