Children played with light on the Giant's Causeway last night as part of the 2015 Unesco Festival of Light.
A stunning sunset created a magical atmosphere as the world-famous stones were turned blue when the Causeway joined Unesco World Heritage sites to create a 'light-map' across the British Isles - shedding new light on 12 famous landmarks.
The event was held to mark 2015 as the Unesco International Year of Light and Light-based Technologies. Light plays a vital role in our daily lives, Unesco said.
It has revolutionized medicine, opened up international communication via the internet, and continues to be central to linking cultural, economic and political aspects of the global society. Unesco spokesman John Dudley said: "The International Year of Light is a tremendous opportunity to ensure that international policymakers and stakeholders are made aware of the problem-solving potential of light technology."