No, Nigerians cannot go to Europe without a visa. Europe follows a unified immigration policy known as the Schengen Agreement which requires visitors from many non-European countries, including Nigeria, to obtain a Schengen visa before entering any of its member states. This means that Nigerians need to apply for and obtain a Schengen visa from either their desired European destination country's embassy or consulate in Nigeria, or through a specific designated country if there is no representation of their chosen destination. The Schengen visa allows entry into all member countries within its validity period.