Since you did not specify the direction for longitude, there are 2 answers to your questions. For 53 degrees north latitude and 3 degrees east longitude: North Sea. For 53 degrees north latitude and 3 degrees west longitude: Liverpool, England.
A point 5.8 miles NE of Dina, in Alberta province, Canada, is located at 53 degrees north longitude and 110 degrees west latitude. Another point, 8.4 miles NE of Kurbinskiy, Respublika Buryatiya (Buryat Republic), Russia, is located at 53 degrees north longitude and 110 degrees east latitude.
No. The north pole is located at 90 degrees north latitude, and the south pole at 90 degrees south latitude. All of the meridians of longitude come together at the poles, so each pole has every longitude.
The country of Canada's latitude and longitude are 45.4000 degrees N, 75.6667 degrees W. Canada is located in North America. Canada ranges in latitude from about 41.7° north to about 83.1° north. It ranges in longitude from about 52.6° west to 141.0° west.