One of the most impressive Ancient Roman monuments, the Pantheon (built in 126 AD) is a lasting testimony to the brilliance of Roman architecture, offering a unique opportunity for visitors to step back two millennia and experience the glory that was Rome. The spectacular proportions, design, harmony and elegance are an extraordinary reminder of the architecture of one of the greatest empires in the world. The purpose of the Pantheon is unknown but the pediment decoration, porch and name suggest a temple of some kind. Admission to the temple is free. But, if you want to enjoy a drink at a restaurant near the Pantheon, be ready to overpay for it.