The heart of Spain, Madrid, boasts grand avenues, world-class museums, and historic landmarks.
The Prado Museum houses a vast collection of European art, including works by Goya and Velázquez. Visit the Palacio Real, the official residence of the Spanish royal family, showcasing opulent interiors and expansive gardens in the heart of the city.
Originally built for various reasons, from defensive fortifications to storage and religious sanctuaries, many of these underground cities have endured over centuries, preserving fascinating glimpses into past lives and cultures.