Guardian of the 'Gateway to England', this giant of a castle displays a solid strength and determination that has obviously carried it through many troubled times. Proudly standing atop the White Cliffs, overlooking this busy port, Dover Castle, in Dover, Kent, England has withstood the test of time remarkably well throughout its long and eventful history. Dover Castle, as it stands today, dates from the rebuilding work during Henry II's reign, but the site has been of vital importance since the Iron Age.