There are many great travel destinations in Europe that are perfect for summer. Some popular options include:

• Greece: The Greek islands are a popular destination for summer, with their clear waters, sandy beaches, and ancient ruins. The islands of Santorini, Mykonos, and Crete are particularly popular.

• Italy: Italy is home to many beautiful cities and towns, including Rome, Florence, and Venice, which are all perfect for summertime visits. Beaches like Amalfi coast and Sardinia are also great for summer vacation.

• Spain: Spain is another popular destination for summer, with many beaches, cities and towns to explore. The islands of Mallorca, Ibiza and Menorca have great weather and beaches in summer.

• France: France has many great destinations for summer, including the French Riviera, Nice, Cannes, and Saint-Tropez. The region of Provence is also a popular destination, with its charming villages and lavender fields.

• Croatia: Croatia is another great destination for summer, with its clear waters, beaches, and historic towns. The islands of Hvar and Krk, as well as Dubrovnik, are particularly popular.

• Portugal: Portugal is a great destination for summer, with its beaches, historic towns, and warm weather. The Algarve region is especially popular, with its beautiful beaches and resorts.

Ultimately, the best travel destination in Europe for summer will depend on your personal preferences and interests.