Whether Green Card holders can travel to Europe without a visa largely depends on their passport nationality. For those whose nationalities require a visa to enter Europe, a Green Card alone does not grant visa-free access to most European destinations.
Typically, when people refer to "Europe," they are often thinking of the European Union (EU). Unfortunately, Green Card holders cannot enter most EU countries solely with a U.S. Green Card unless their nationality is on the visa exemption list.
However, it’s important to note that Europe encompasses more than just the EU. Green Card holders may find that they can travel to some European countries without needing to apply for a visa. Therefore, it’s essential to check the specific entry requirements for each destination based on your nationality before planning your trip.