Zoo Lights
In Washington DC, the National Zoo is part of the part of the Smithsonian Institution. Every year the zoo hosts ZooLights, an event where environmentally friendly LED lights decorate the zoo.
I am sharing a sample of some of the installations.
Final information
The zoo will continue to have ZooLights through January 1st. The best part, admission is free. You can find more event information here.
These are just a sample of the installations.