Novi Grad (Sokovian Cyrillic: Нови Град) was the capital city of Sokovia, until its destruction during the Battle of Sokovia.
Ultron chose the city as the starting point for his new world order. Using vibranium purchased from an underground dealer in Wakanda, he planned to lift a massive part of the city skyward and send it plummeting back to Earth, creating an extinction-level event similar to the asteroid that wiped out the dinosaurs. Fortunately, the Avengers arrived and defeated Ultron before he could do so.
Despite the Avengers' best efforts, thousands of lives were lost during the battle, including Quicksilver and the family of Helmut Zemo. In response to the frequent collateral damage brought on by the Avengers, the United Nations ratified the Sokovia Accords, a series of documents forbidding the Avengers to operate overseas without government oversight.