One of the most common mistakes is trying to see too much in too little time. Europe is dense and well-connected, but rushing from city to city every other day can leave you exhausted and unable to truly enjoy any destination.
What to do instead: Choose fewer cities and spend more time in each. Give yourself at least 3 days per major city, and more if possible. Quality over quantity will leave you with richer memories and a more relaxing trip.
In our world of today we see some great infrastructures around us. If we look around us we do find strange place too, made by humans only with least help of machines those are available today. There are places you find strange even to visit as it is very difficult to reach there but people are living there for ages now. Have a look!