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Robert Harding Picture Library

Construction of the soaring Cathédrale Saint-Pierre-et-Saint-Paul in Troyes, France, began around 1200.

The neo-Gothic town hall serves as the architectural focus at the heart of Vienna. The Austrian capital’s historic city center was inscribed on UNESCO’s World Heritage list in 2001.

A man with a tattoo on his arm fishes in Fakarava, the largest atoll in French Polynesia that’s part of a UNESCO biosphere reserve.

A hot air balloon ride is one of the best ways to experience Turkey’s breathtaking Göreme National Park.

Hot air balloons soar over Turkey’s Göreme National Park, one of many unforgettable UNESCO World Heritage Sites perfect for family adventures.

India’s Ajanta Caves contain some of the world’s oldest and most breathtaking Buddhist art, including carved shrines surrounded by beautiful paintings on the walls and ceilings.

Lakes that are rich in carbonates and phosphorous, such as Mono Lake in California, are thought to have been common on early Earth, perhaps providing an environment for life to form.

Elephants play in a mud bath in South Africa. In the wild, much of elephants' stimulation comes from other elephants.

A climber abseils from a steep cliff in the Ogwen Valley, on the Glyderu mountain range. Snowdonia's history of rock climbing and mountaineering is as prestigious as it gets: Edmund Hillary and Tenzing Norgay both trained and tested equipment on Snowdon and the Glyderau before their 1953 ascent of Everest; George Mallory even gave a part of Everest – the Western Cwm – a Welsh name due to its reminiscence of Snowdon.