Given the task definition and input, reply with output. In this task you will be given a text passage from a trivia quiz. You should choose the category this question belongs to from these categories: History, Science, Social Science, Fine Arts, Literature. You can only choose one category, so if in doubt, please choose the closest match.

This city houses the headquarters of OPEC as well as the International Atomic Energy Agency. In 1857, this city's ancient walls were demolished in favor of a Ringstrasse_,_ now lined by many notable buildings such as the Rathaus, the Hofburg Palace, and the State Opera. This city's St. Stephen's Cathedral features a distinctive tiled roof characterized by its colored zigzag pattern and prominent double-headed eagles. This city's Schonbrunn Palace was the summer residence of rulers like Maria Theresa and Franz Joseph. For 10 points, name this former center of Habsburg power and current capital of Austria.
History