What are your geographic extremes

[retromike22]

(The furthest place you have visited in each of the four cardinal directions)

Northernmost: Mammoth Hot Springs, Yellowstone National Park, Wyoming.
Southernmost: Tombstone, Arizona.
Easternmost: Washington D.C.
Westernmost: Muir Woods National Monument, California.

[retromike22]

Northernmost: Michigan's Upper Peninsula
Southernmost: St. Louis, Iowa
Westernmost: Like, what, Dubuque, Iowa?
Easternmost: Eh... Somewhere in Michigan?

You've never gone to Canada?! It's like, right there.

[retromike22]

North: Yellowstone National Park, WY (1996)
South: Tombstone, AZ (2015 & 2016)
West: Muir Woods, just northwest of San Francisco, CA (2009)
East: New York City, NY (2016)

[retromike22]

(The furthest place you have visited in each of the four cardinal directions)

Northernmost: Mammoth Hot Springs, Yellowstone National Park, Wyoming.
Southernmost: Tombstone, Arizona.
Easternmost: Washington D.C.
Westernmost: Muir Woods National Monument, California.

Updated, amusingly these have all been on trips with atlas posters-

Northernmost: Seattle, WA (with rfayette, crumpets, and mechaman)
Southernmost: Galveston, TX (with rfayette)
Easternmost: Portland, ME (with mattvt, sawx, and zen lunatic)
Westernmost: Eureka, CA (with sprouts)