So, they check passports carefully. A German backpacker I met later said he had a hard time explaining why he had been to Pakistan. But I was soon in old San‘a, a world heritage site, staring up stupefied at the mud-brick tower of my hotel. All around bathed in the moonlight were similar towers with crenellated roofs and arched windows punched in like holes, but framed in elaborate white plaster friezes zig-zagging the facades. The effect has been likened to gingerbread houses lined with icing. It was a steep climb to my room. The Yemeni association with skyscrapers predates bin Laden by thousands of years.