<p>Carved into rose-colored rock in Jordan, the ancient city of Petra shows architectural influences from Greece, Egypt, Rome, Syria, and multiple North African cultures. Unsustainable tourism, flash floods, rockfalls, and erosion threaten the site.</p>

Carved into rose-colored rock in Jordan, the ancient city of Petra shows architectural influences from Greece, Egypt, Rome, Syria, and multiple North African cultures. Unsustainable tourism, flash floods, rockfalls, and erosion threaten the site.

Photograph by Gordon Wiltsie, Nat Geo Image Collection

These 50 Treasured Places Are At Risk of Disappearing

The newly listed sites include an ancient underwater city in Greece, historic churches in Cuba, and a masterpiece of modern engineering.

Fifty cultural heritage sites in 36 countries are threatened by everything from climate change and looting to natural disasters and commercial development, according to a report released Thursday by the World Monuments Fund.

Compiled every two years, the World Monuments Watch list raises awareness and mobilizes funding for the preservation of endangered sites of outstanding significance. In its 20-year history, the program has named 790 sites in 135 countries and arranged roughly $350 million of financial support for treasured places around the world.

The 50 sites on the 2016 list range from World War II concentration camps in Italy to the approximately 5,000-year-old underwater city of Pavlopetri off the coast of the Southern Peloponnese in Greece.

Spanning Europe, Africa, Asia,

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