Parts of the city's main drag were still occupied by barricades and tents of Maidan militants at the time of writing, but these were being gradually dismantled. Outside revolution periods, Kreshchatyk (named after a river now running in a pipe underneath) is a great place for an evening stroll and watching locals in their element.
During WWII the retreating Soviet army mined the buildings here, turning them into deadly booby traps for any German soldiers setting foot inside. Most places exploded or caught fire, which is why it had to be rebuilt in the current Stalinesque style.
Khreshchatyk is at its best during weekends, when it's closed to traffic and becomes a giant pedestrian zone. But while the guerrilla camp is still there, there is no traffic anyway.