Convention Center lit up at dusk, Hannover, Germany

Castle lit up at dusk, Klopp Castle, Bingen, Germany

Church and castle lit up at dusk, Klopp Castle, Bingen, Germany

Museum lit up at dusk, Elbe River, Albertinum Museum, Dresden, Saxony, Germany

House lit up at dawn on beach, Ahlbeck Pier, Usedom Island, Germany

Hotel lit up at dusk, Hotel Ahlbecker Hof, Ahlbeck, Usedom Island, Mecklenburg-Western Pomerania, Germany

Traffic on road at dusk, Boulevard Royal, Luxembourg City, Luxembourg

Tourists at market lit up during dusk

Buildings in town lit up at dusk

Lit up port at dusk, Hamburg, Germany

Colonnade lit up at dusk, Rome, Italy

Cathedrals lit up at dusk, Thuringia, Germany

Lit up shipbuilding yard at dusk, Hamburg, Germany

Lit up shipbuilding yard at dusk, Hamburg, Germany

Electric lights lit up Yerebatan Cistern, Istanbul, Turkey

Buildings lit up at dusk, Bleichenfleet, Hamburg, Germany

Village in valley lit up at dusk, Austria

Buildings lit up at dusk, Katharinenkirche, Hamburg, Germany

Village in valley lit up at dusk, Austria

Person holding bulb

Close-up of a boy thinking

Robotic hand holding a light bulb

Customer and a sales clerk standing at a checkout counter

Close-up of a young man holding a credit card and a credit card reader

Businessman standing by building and lightbulb

Businessman with lightbulb head pointing to the key

Close-up of lightbulb with brain and key

Close-up of a young man eating soup and looking at a bee

Boy and girls in school uniform with a notebook

Electric light lit up at dusk on pier