For travelers visiting Kolkata, it is important to ensure that their passport is valid for at least six months beyond their intended departure date. Visas are required for most foreign visitors, and it is advised to check the specific visa requirements based on their nationality. Additionally, it is recommended to be up-to-date with routine vaccinations before traveling to Kolkata. Travelers should also stay informed about any travel advisories and entry restrictions that may be in place for foreign visitors.