The longest train journey in the world, lasts about 21 days. It's a trip that starts from Portugal in Europe to Singapore in Southeast Asia, with several places to visit.

This journey starts from the city from Portugal to the capital Singapore.

The train crosses practically 13 countries with stops for visits, starting from Portugal, Spain, France, Germany, Poland, Belarus, Russia Mongolia, China, Laos, Thailand, Malaysia, Singapore. How good would this be