Question: best unique things to do in washington dc?
Answer: Add National Capitol Columns to a New List. Washington, D.C. National Capitol Columns. ... 
Add The Exorcist Stairs to a New List. Washington, D.C. The Exorcist Stairs. ... 
Add International Spy Museum to a New List. Washington, D.C. ... 
Add The Mansion on O Street to a New List. Washington, D.C.