National Geographic : 1935 Feb
THE ROSE-RED CITY OF ROCK ) INatlonal iLeographic Society Finlay Photograph by G. E. Matson WHERE NATURE RENT ROCKS ASUNDER, A WAY WINDS THROUGH TO PETRA The Siq, main avenue of approach to the age-old city, is 6,000 feet long as the crow flies, and its turnings increase that length. Stupendous walls, in some places only 20 feet apart, hedge it in, towering so high that caravans seen from the top look antlike. The road was once paved throughout with 18-inch blocks of stone, some of which are still in place. This approach rendered ancient Petra well-nigh impregnable when intelligently defended.