The LDS Temple in Kensington, Maryland, which stands near the I-495 Capitol Beltway Freeway, is known for its gorgeous grounds and the annual Festival of Lights, a free event open to the general public. The event features a presentation of hundreds of thousands of Christmas lights and numerous international nativity scenes on display.
Between December 3 and January 1, the lights are on from dusk until 10pm. Also, fantastic musical presentations (by local groups and performers, both LDS and not) are held nightly at no cost to the general public. For more information, see the official website: http://dctemplelights.lds.org/
Merry Christmas, everyone!