The Baths of Diocletian—the biggest baths for public in Imperial Rome— which is covered 32 acres. In spite of the fact that a significant part of the first perplexing was destroyed or incorporated into later churches and palaces, what remains still offers a sense of the vast structure, which hosted up to 3,000 bathers in its prime. The first mind boggling, worked from 298 to 306 AD, encompassed a gymnasium, library, stadium, gardens, galleries, and strolling paths! A visit today includes a bit of the first baths—its high ceilings, a funerary sculpture, and two second-century tombs. You can also walk its sixteenth century garden, spotted with workmanship.