How to plan a 3-week backpacking route through Europe

Limit your trip to four major cities to avoid spending your entire budget and energy on trains. Dedicate 4-5 days to each location to balance sightseeing with the logistical reality of travel days.

1. Define your anchor cities. Pick two major hubs that are at least 800km apart, such as Berlin and Rome. Use these as your 'start' and 'end' points to create a logical geographic flow rather than zig-zagging.
2. Identify your transport spine. Use a site like Rome2Rio to check high-speed train connections between your chosen cities. If a journey takes longer than 6 hours, book a budget airline flight (e.g., EasyJet, Ryanair) to save time.
3. Layer in secondary stops. Choose one smaller town or secondary city to sit between each of your anchor cities. This breaks up long travel days and keeps the pace sustainable.
4. Calculate 'transit buffers'. Always add 4 hours to any transit estimate to account for getting to/from train stations, checking into hostels, and grabbing a first meal in a new city.

Should I buy a Eurail pass?

Only if you plan on taking more than 5 long-distance trains in 21 days. Otherwise, point-to-point tickets bought in advance are almost always cheaper.

Is 3 weeks enough time to see all of Europe?

No. Trying to see more than 5 cities in 21 days will lead to 'travel burnout' where you spend more time looking at train windows than exploring.