Landmarks No Longer Exist

Azure Window, Malta

https://en.wikipedia.org/wiki/Azure_Window

Sutra Baths, San Francisco

The Sutra Baths were a large, privately owned swimming complex in San Francisco. A fire destroyed most of the baths in 1966, but the remaining were preserved as part of the Golden Gate National Recreation Area.

Wall Arch, Arches National Park

https://www.nps.gov/arch/learn/news/news080808.htm

Others

From the internet:

• http://mentalfloss.com/article/88385/10-natural-landmarks-no-longer-exist
• http://mentalfloss.com/article/71735/8-popular-tourist-attractions-no-longer-exist
• http://www.cnn.com/travel/article/attractions-no-longer-exist/index.html
• https://www.msn.com/en-us/travel/article/10-natural-landmarks-that-no-longer-exist/ar-AAkiUYC