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Travel is great niche for online business. Many ideas can be used whether it is domestic travel or international. Lately Domestic travel is huge because of Covid. But now for summer of 2021 USA citizens are allowed to travel to many places in Europe. For the summer of 2021 Greece, France, and Italy is opening and allowing those who are vaccinated or those who tested negative 72 hours before their flight. Check this link below for more information where Americans are allowed to travel.