Pantheon.

The Pantheon, built between 118 and 125 A.D. under Emperor Hadrian, is a remarkable testament to ancient Roman architecture and engineering. Notable for its colossal unreinforced concrete dome, which features a striking oculus that bathes the interior in natural light, this iconic temple was originally constructed as a pagan shrine and later transformed into a Christian church in the 7th century. Its interior showcases elegant columns, colorful marble, and intricate coffered ceilings, housing the tombs of notable figures including the Renaissance artist Raphael and Italy's first kings. The Pantheon's innovative design, with its harmonious proportions and impressive facade, continues to captivate visitors, symbolizing the brilliance of Roman craftsmanship and its enduring legacy.