There are several easy ways to travel in Europe. Travelling in the off season is definitely the easiest and cheapest way to travel. The Eurail is the best way to travel from country to country within Europe.
I did something similar last year, and honestly the hardest part was keeping all the cities, transport options, and dates organized without losing my mind. What helped me was using a site where I could lay out every stop in one place and see how the route connected — trains, buses, even flights if needed. It made it way easier to adjust when we decided to stay longer in one city or add a new destination at the last minute. If you want that kind of setup, check out Pinerary. It’s simple but really handy for long, multi-country trips because you can actually see how your journey fits together. For a two-month Europe adventure, that kind of tool keeps the planning from becoming overwhelming.
Backpacking it, staying in hostels and using the slow trains for transportation makes for the cheapest travel around Europe.
No
I would travel by plane and car around America.
If your between the ages 18-26 you can travel college break. Its the cheapest way to travel. There are over 30 different tours to choose from and it includes everything from flights to hotel to tours.
There are lots of resources online. You can look through your educational institution for housing, or you can do what many traveling students do and stay in hostels as you travel around.
some sections are underground.
I would go by train. The trains in Europe are fast, efficient and on time.
Forbes makes a variety of travel books for individuals including Europe. There are a variety of companies that provide travel books and the best way to figure out which is the right book would be to determine what kind of vacation one wants to take.
The best way to travel to Costa Rica depends on where you are traveling from. If you are traveling from Panama or Nicaragua, it might be best to drive or take a bus. If you are traveling from Europe or North America it might be best to fly.
The best way to travel around Australia is by motorhome or caravan. If you take a motorhome, it is best to tow a small 4WD so you can leave your motorhome at a caravan park and go touring. There is so much to see "off the beaten track".