I lived in Washington, DC for 32 years during my architect years with the U. S. Department of Justice, Federal Bureau of Prisons. I was living on Capitol Hill all that time so I could walk to work. I discovered many neat places. Here are my favorites:
P.O.V. ROOFTOP SKY TERRACE RESTAURANT, W WASHINGTON HOTEL, DC:
On the twelfth floor, it has a beautiful panoramic view of The Treasury Building, White House, Washington Monument, Jefferson Memorial, Lincoln Memorial, up Pennsylvania Avenue and beyond into Southern Maryland and Northern Virginia!