Some of the world's most stunning natural sites and iconic, man-made structures might not be around in the future.
Thanks to a combination of factors like climate change and increased development project proposals in their areas, some of these popular tourist attractions are starting to shrink in size, sink, or erode.
From the breathtaking Alps to the iconic Taj Mahal, we've put together a list of some of the most famous sites you should see before it's too late.
SEE ALSO: 20 places you should visit before they disappear
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Nearly two-thirds of the Great Wall of China has been damaged or destroyed by over-farming, natural erosion, and the selling of bricks that have historic engravings on them.
Read more about how the Great Wall of China is falling apart »
Sources: The Independent, CNN
The iconic Taj Mahal, in Agra, India, has been facing years of pollution and erosion that some experts believe could lead to its collapse.
See rare aerial photos of the Taj Mahal »
Sources: The Daily Mail, The Wall Street Journal
Known for its romantic gondola rides, the city of Venice, Italy, has been sinking for years with severe floods becoming more common over the last few years.
See a satellite map that shows how Venice is sinking »
Source: Time
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