A squirrel pauses for the photographer in Washington Square, Philadelphia, Pa.
An airliner flies into the sun's disc over the Lincoln Memorial in Washington, D.C.
Theo at Fermilab
Sun rays break through clouds at the Lincoln Memorial, Washington, D.C.
Sunlight reflects off of ripples in the World War II memorial fountain in Washington, D.C.
A duck dives in a reflecting pond in Washington, D.C.
The Washington Monument and the U.S. flag against a blue sky in Washington, D.C.
Union Pacific steam engine X4014, a.k.a. 'Big Boy' rolls through Wheaton, Illinois.