The document provides information about attractions to visit in Prague, Czech Republic, including Prague Castle, the largest ancient castle in the world located on a hill overlooking the Vltava River, and the Old Town Square, home to the Gothic Tyn Church and famous Astronomical Clock from 1410. It also briefly mentions attractions in Krakow, Budapest, and other Central European cities, and recommends escorted tour options from companies like Globus and Tauck to visit these areas.