An enormous asteroid potentially larger than the Washington Monument is due to zip past our planet today. For comparison, the Washington Monument is about 555 feet tall, the Golden Gate Bridge is ...

Next, curtains of purple light streak from north to south at a higher altitude, passing directly over the Washington Monument ... Excited oxygen atoms glow red above 120 miles and glow green ...

Even if you're only in town for a short trip, visiting the Washington Monument and the White House – two marble symbols of the U.S. – is a must for any first-time D.C. visitor. Standing just ...

George Washington Birthplace National Monument in Eastern Virginia offers ... to September 15th when the average daily temperature is above 79°F. The coldest months are from December 1 to March ...

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