Traveling to Europe in summers is perhaps not a good decision at all. This comes about due to a number of reasons. Firstly, summers in Europe can be extremely hot, as a result of which even the local residents fly off to distant places for vacations. Furthermore, in summers, most hotels tend to be pre-booked and accommodation hence becomes quite expensive.
Destinations like Museums and Parks remain overcrowded throughout the season. Traveling Off Season might, however, save you hundreds of dollars while still offering you the same level of entertainment and adventure.