What is one of the splendid buildings commissioned by Hadrian in Rome?

The Pantheon is indeed one of the most remarkable buildings commissioned by Emperor Hadrian in Rome. Originally built by Agrippa, the structure was later reconstructed by Hadrian around 126 AD. It is renowned for its impressive dome, which remains one of the largest unsupported concrete domes in the world, showcasing the architectural innovations of the time.

Hadrian's Pantheon is recognized not only for its size and beauty but also for its design, which symbolizes the cosmos and serves as a temple for all gods. The oculus, or the central opening at the dome’s apex, allows natural light to illuminate the interior while also serving as a connection between the temple and the divine. The Pantheon reflects Hadrian’s dedication to architecture and the arts, making it a significant representation of Roman engineering and artistic achievement during his reign.

The other structures mentioned, such as the Colosseum, Temple of Apollo, and Roman Forum, are significant landmarks in their own right but were either constructed or heavily modified by different emperors or officials, not specifically commissioned by Hadrian.