The following video was filmed a few years ago while walking around Sa’ada. You can see the beautiful city and happy children before it was bombed.
Sa’ada, in northern Yemen, is held by Houthi rebels and was repeatedly bombed by Saudi Arabia. The city is a UNESCO World Heritage Site. Some of the destroyed buildings were over 500 years old. The Guardian has a photo gallery of the city after the airstrikes. You can read the damage assessment, as of May 20th 2015, from Relief Web.