world travel; globe-trotting
Refers to traveling around the world, often as a leisure activity or long-term journey.
He is planning a world trip after retirement.
I'm saving money to make my dream of traveling the world come true.
海外旅行 means 'overseas trip' (any foreign country), while 世界旅行 specifically implies traveling around multiple countries or the whole world.
世界一周 (around-the-world trip) emphasizes circling the globe, often with a set itinerary, whereas 世界旅行 is a broader term for world travel.
Compound of 世界 (world) and 旅行 (travel).