Zagreb is made for strolling. Wander through the Upper Town's red-roof and cobblestone glory, peppered with church spires. Crane your neck to see the domes and ornate upper-floor frippery of the Lower Town's mash-up of secessionist, neo-baroque and art deco buildings.
With equal measures of grunge and grace, Athens is a heady mix of history and edginess. The magnificent Acropolis, visible from almost every part of the city, is the hub around which Athens still revolves.