[The Tehran Museum of Contemporary Art keeps] the outlaw paintings in the basement, locked in the museum’s vault. Not just the Picassos — the Kandinskys, the Miros, the Warhols. The Monet, the Pissarro, the Toulouse-Lautrec, the Van Gogh. Possibly the best Jackson Pollock outside the U.S. Ruled by one of the most vehemently anti-Western governments in the world, Iran is, by many assessments, home to the most extensive collection of late 19th and 20th century Western art outside the West. It is a treasure trove of masters that is all but forgotten outside knowledgeable art circles because, for all but a few of the last 30 years, it has been virtually unseen.