Continents visited:
North America
Europe
Asia

Not visited:
South America
Africa
Australia
Antarctica

United States:
visited:
Connecticut
Maine
Massachusetts
New Hampshire
Rhode Island
Vermont
New York
New Jersey
Pennsylvania
Delaware
Maryland
Virginia
North Carolina
South Carolina
Georgia
Florida
West Virginia
Michigan
Ohio
Kentucky
Tennessee
Alabama
Mississippi
Louisiana
Missouri
Indiana
Illinois
Wisconsin
Oklahoma
Texas
Nebraska
Iowa
California
Colorado
Arizona
Nevada
Utah
District of Columbia
Kansas
Washington
Alaska
New Mexico
Oregon
Montana
North Dakota
Minnesota
Arkansas

Not visited:
South Dakota
Idaho (slept through it on a train)
Wyoming
Hawaii

Canada:
Visited:
Prince Edward Island
Nova Scotia
New Brunswick
Quebec
Ontario
British Columbia

Not visited:
Alberta
Saskatchewan
Manitoba
Newfoundland
Yukon
Nunavut
Northwest Territories

Mexico:
Visited:
Tamaulipas
Quintana Roo

Not visited:
all the others

Other countries visited:
Bahamas
England
France
Spain
Luxembourg
Netherlands
Germany
Switzerland
Italy
China
Bermuda
Wales (but just barely)
Ireland
new> Vietnam
new> Greece

Arguable:
Japan (never left airport)
Iceland (spent a couple of hours in Reykjavik’s airport (which
is in Keflavik))
South Korea (spent several hours in Incheon airport.

Questionable as to whether they count as countries:
Jersey
West Germany
East Germany