Built between 1609 and 1613, this opulent structure - fountains, gardens, pink marble walls, frescoed ceilings - seems ideally suited to house one of the world's best collections of art. And that was exactly what it was built for. Architect Flaminio Ponzio designed it for the cardinal and art collector Scipione Borghese, who wanted a party villa on the edge of town where he could house his enormous collection of priceless art. In 1901, the collection (and the gallery, and the park that surround