I haven’t traveled through all of the European countries but some that I have visited or are on my list to visit are:

• Germany
• France (south of France in the summer)
• Spain (Madrid, Barcelona)
• Portugal
• The Greek Islands
• ITALY (I love Italy, north and south)
• England (London of course)
• Czech Republic (Prague)
• Hungary (Budapest)
• Russia (St. Petersburg and Moscow)
• Ukraine (Lviv and Kiev)

So basically everywhere! It really depends on where you want to travel and your funds. Italy, Portugal, Spain and Greece are generally cheaper, whereas Germany, Switzerland and England are much more expensive.