were traditionally finished with timber shingles weighted down with stones; but in almost all cases this has now been replaced with corrugated galvanised iron roofing. The roof of Tongsa Dzong, illustrated, is one of the few shingle roofs to survive and was being restored in 2006/7. The courtyards, usually stone-flagged, are generally at a higher level than the outside and approached by massive staircases and narrow defensible entrances with large wooden doors. All doors have thresholds to discourage the entrance of spirits. Temples are usually set at a level above the courtyard with further staircases up to them. Modern architecture in the dzong style Larger modern buildings in Bhutan often use the form and many of the external characteristics of dzong architecture in their construction, although incorporating modern techniques such as a concrete frame. University of Texas at El Paso The campus architecture of the University of Texas at El Paso (UTEP) is a rare example of dzong style seen outside the Himalayas. Initial phases were designed by El Paso architect Henry Trost, and later phases have continued in the same style. UNESCO tentative listing In 2012, the Bhutanese government listed five dzongs to its tentative list for UNESCO World Heritage Site inscription in the future. The five dzongs are Punakha Dzong, Wangdue Phodrang Dzong, Paro Dzong, Trongsa Dzong and Dagana Dzong. See also Architecture in Tibet Architecture of Bhutan Driglam namzha References Further reading External links Dzongs of Bhutan Designs for Trashi Chhoe Dzong Precinct, Thimphu, Bhutan ! Architecture in Bhutan Tibetan Buddhist architecture Architectural history Architectural styles