The document discusses neoclassicism as an architectural style between 1750-1850 that drew inspiration from classical antiquity, specifically ancient Greek and Roman architecture from the 5th century BCE and 2nd century CE. Some examples of neoclassical architecture mentioned include the Schielandhuis in Rotterdam from 1662-1665, the Brandenburg Gate in Berlin from 1789, and the United States Capitol building in Washington D.C. from 1793.