Legistorm is a great site to see privately paid for travel by members of Congress and their staffs. It includes Google maps and has additional links to bios, staff salaries, and personal finances. Can search by member, organization, or key word search. For example “Housing” as a key word works.  Privately Paid for Travel by Members of Oregon delegation: 
  Senate 
  Gordon Smith 
  Ron Wyden
  House
  Earl Blumenauer
  Peter DeFazio
  Darlene Hooley
  Greg Walden
  David Wu