Sunset above Tröllafossar waterfalls in Iceland in the winter. Long exposure aerial photo captured with a camera drone (Phantom) with aid of a ND16 filter. Tröllafossar means waterfalls of the trolls. Photographer: Paul Oostveen.

Sunset above Tröllafossar waterfalls in Iceland in the winter. Long exposure aerial photo captured with a camera drone (Phantom) with aid of a ND16 filter. Tröllafossar means waterfalls of the trolls. Photographer: Paul Oostveen.