Italy, Puglia, Bari, Conical dry stone rooves of trulli houses, Rione Monti, Alberobello.

Canada, Alberta, Icefields Parkway, Snow covered mountain escarpment.

Canada, Alberta, Icefields Parkway, Snow covered mountain escarpment.

Nepal, Colorful layered mountains and eroded plateau along the route from Ghemi to Lo Manthang.

Nepal, Upper Mustang, Layered mountain structure near Lo Manthang city.

USA, Arizona, Grand Canyon, Cactus within the Hualapai Indian reservation part of the national park.

USA, Arizona, Grand Canyon, tourists looking down onto the Colorado river from within the Hualapai Indian reservation part of the national park.

USA, Arizona, Grand Canyon, Colorado river running through the Hualapai Indian reservation, part of the national park.

Food, Vegetables, Onions, Three ripe harvested onion bulbs or Allium against a white background with one sliced open to show structure of layers.

Food, Dairy Product, Cheeses, Slice of cheese comprised of five different British cheeses.

England, East Sussex, Birling Gap, looking up at chalk cliff face showing various strata layers.

Canada, Alberta, Banff National Park, Castle Mountain a castellate formation of horizontal layers and verticle towers.