If the country you plan on visiting requires a visa, and you do not have one, you will be denied entry into the country. Visa requirements are not universal, and foreign countries will often require visitors from certain countries to obtain visas, but not others.
It is common knowledge that the right camera angles and lighting can make virtually anything look radically different. Hotel rooms can look twice as large, and that view of the refinery can be blurred out. Food can photograph better than it tastes. Actors can be hired to look happy doing anything. Tip: Talk to a travel planner who has recently been to the destination and/or call the local tourism bureau.