Here’s how to celebrate the Southeast Library, which opened on Dec. 8, 1992.

UFO-like designs, celebrity armadillo races, and perceived hidden anti-war messages are all part of the Kennedy Center’s 50-year history.

She had her very own cake topped with a multi-colored rosette.

Bei Bei turns 1, Bao Bao turns 3, and Tian Tian turns 19, all within a few days of one another. The National Zoo celebrated them on Saturday.

A Maryland county has restricted hugging and handing out birthday party invitations in public elementary schools.

The Obama family’s Portuguese water dog is four years old today. That’s 28 in dog years.

Capital Bikeshare is two years old!

Obama is spending a low-key birthday weekend before going back into full campaign mode.

Sitting as a western bookend of the National Mall and the first sight a driver will see while crossing the Memorial Bridge, the Lincoln Memorial may be one of the city’s most iconic monuments. Today, it celebrates its 90th birthday.

On this day in 1802 the City of Washington was incorporated by Congress, the first step in the then-ongoing creation of a new capital for the nation.