Hadrian 's country residence, built (с AD 125–34) at Tivoli near Rome.
A sumptuous imperial complex with parks and gardens on a grand scale, it included baths, libraries, sculpture gardens, theaters, alfresco dining areas, pavilions, and private suites. The buildings, which covered about 7 sq mi (18 sq km), were reproductions of celebrated structures the emperor had seen in his travels. The uneven terrain made necessary large flights of steps and terraces. Significant portions have survived to modern times.