There are over 1,000 UNESCO World Heritage Sites, of which 830 are cultural. These landmarks or areas hold such strong cultural, historical, or scientific significance, international treaties have been signed in order to protect them. However, more than 50 of these sites are currently endangered and could face irreparable damage if no measures are taken, according to UNESCO's website.
Click on the gallery to explore 15 of the world's most at-risk cultural sites.