Beograd

Founded in the Third century BC, it's located just over the confluence of the Danube and Sava Rivers. It suffered from both repeated destruction and renovation since its founding until the last destruction in 1941, when attacked by German's  Luftwaffe in WW II.
Visit the National Museum which has a huge collection of prehistoric artifacts, icons, frescoes, and paintings. In Kalemegdan Park you might find amusement parks, lovers, and both Albanian and Gypsy indigents. But the major attractions are the Orthodox Chapels and outstanding Military Museum. Beside, Fresco Museum which houses original copies of the vivid and dramatic medieval Serbian Frescoes.
Do not miss to scroll down along the bustling downtown, it's a diverse mix of the XIXth century palaces, modern architecture, and a few Turkish-style narrow streets.
Explore the old quarter, linger in the cafes, or even join the parade of Ulica Skadarska, the restored Bohemian haunt.

Athens

 It is an ancient city, which has about 7000 years history of civilation. But you may not find the imagination you had before your arrival. Traffic noise and smoggy environtment will welcome you.
Don't worry , spent on the coast of Crete or climb the mountain of Peloponesse or the Acropolis or stroll along the alleys of Plaka or go to the National Garden.  Syntagma Square is the center point of tourists where you can find the Parliament, top hotels, cafes, banks, airlines, and important buildings.
National Garden which contains the Zappeion Area , the center of nightlife of Athenian. The Plaka has a narrow streets lined with trees, stores, and discos. Monastiraki, an old section, home of the flea market and Agora, the market place and administrative center of old Athens and the site of massive archeological works.
Or, visit Omonia Square, the noisy downtown or Acropolis museum which houses the famous caryatids, i.e column in the shape of woman, of the Erechtheum.

Lisboa

In 1755 this city was destroyed by a disastrous earthquake which demolished almost all buildings in this beautiful medieval city. But the character of the city still remain intact, and today the glorious days of the XVth century is over. But the friendliness of the Lisboetas will make you feel happy and stick in your memory.
Both food and accommodation, perhaps the least expensive comparing with any other capitals in Europe. The most interesting place in the city is Alfama which is called by Alexandre Herculano " A labyrinth, confused, heaped up, multi colored, and re-twisted -an outskill of souls "
Look into San Miguel the finest of the many churches here. Miradouro de Santo Lucia, an intimate square of tiles and grapewines when you can explore the view of the Alfama and the harbor below as well.
Visit also the Museum Nacional de Arte Antigua, specializes in Portuguese primitive and painting by Bosch, Durer, and Hoblein the Elder.