The Washington Post has a very good tool to estimate taxi fares in the Washington DC area. I have used it several times and the ranges they give have been pretty accurate all times I’ve compared with my cab rides. Link: District Taxi Fare Estimator Tool
Please note that the estimator does not include extra fees [...]
Map Network has very nice interactive maps, where you can see the location of attractions, restaurants, etc for the major US cities. Just click on a building to see pictures, contact information and website of the venue.
The picture below is a map of the National Harbor (DC/Maryland) area:
For other destinations: