Very few!
Here is a list of places you can walk on, starting at the North Pole and going south:-
# North Pole (not a country, as such, just a spot within a huge plateau of ice floating over the northernmost part of the Arctic Ocean)
# Wrangel Island
# Chukot1, Siberia, the north eastern tip of Russia. After Chukot you will pass between the Alaskan Aleutian Islands and traverse the Pacific Ocean down to the
# Fiji Islands, starting at the north-eastern tip of Vanua Levu Island, and finishing by passing over Taveuni Island. Then, continuing south, it is a huge trip until you get to the
# Ross Ice Shelf of Antarctica, the southernmost land-mass continent of the world, 98% of which is covered with ice.
Still continuing south, and still on the ice, you will pass between some of the Queen Maud Mountains, part of the Transantarctic Mountain range, before you reach the icy South Pole itself.
Footnote
1. 'Chukot' = Chukotka Autonomous Okrug
For more information and some photographs, see Related links below.
The Prime Meridian and the 45th Meridian West pass through Greenland.
The Prime Meridian is the definition of zero longitude.
The prime meridian passes through Greenwich, England.
The Prime Meridian actually passes through three continents, Europe, Africa and Antarctica.
The three countries that the Prime Meridian passes through are -- England -- France -- Spain -- Algeria -- Mali -- Burkina Faso -- Togo -- Ghana.
The prime meridian offically passes through the Royal Observatory in London.
the prime meridian passes through Africa an Europe
The Prime Meridian and the 45th Meridian West pass through Greenland.
The Prime Meridian is way east of Madagascar.
The Prime Meridian is the definition of zero longitude.
Ghana, Togo, Burkina Faso, Mali and Algeria
No.
No
No
No
The prime meridian passes through Greenwich, England.
Neither the equator or the prime meridian pass through Miami