Vienna is conveniently located on the rail lines between Venice, Budapest, and Prague, the crossroads between Eastern and Western Europe. Vienna stands at the heart of Europe, smack on the intersection between the East and West. Conquerors--Celts, Romans, Babenbergs, and finally the Hapsburgs--have all left their marks. Now Vienna is the sole EU capital with a UN headquarters. Viennese architecture tends toward the massive. You feel quite small walking the city center as monumental buildings brood over you, and many visitors have reported a coldness to Vienna that they can't really put a finger on. But there is a warmth to Vienna as well. Coffee shops buzz with life, trams full of people clatter along, crisscrossing the city in abundance.