Imagine you are an Arabian incense trader in 100 B.C. Arriving in Petra, you enter through the Six—a long, winding gorge cut into the rocks surrounding the city. Towering cliffs cut off the sunlight along the narrow passageway. As you round the final bend, you get your first glimpse of the city—a grand monument cut into the cliffs.

Image credits: main image, courtesy of courtesy of Jordan Tourism Board North America.