Earth like you've never seen it before: Stunning aerial photos reveal beauty of frozen rivers, rainbow tulip fields and the turquoise waters at the Great Barrier Reef

• These incredible photos have been entered in the 2015 National Geographic Traveller Photo Contest
• The competition has been running for 27 years and usually received 18,000 entries globally 
• Jijian Fan snapped a mesmerising photo of a frozen river channel while flying over Alaska
• A bird's view of tulip fields near Voorhout in the Netherlands was photographed with a drone