A citizen of a foreign country who wishes to enter the United States must generally first obtain a U.S. visa, which is placed in the traveler's passport, a travel document issued by the traveler's country of citizenship.Some international travelers may be eligible to travel to the United States without a visa if they meet the requirements for visa-free travel. The Visa section of this website discusses US visas for Colombian citizens or other visa-requiring nationalities who wish to travel to the United States.