Undoubtedly the most famous example of a preserved smokestack. The Tate Modern. Formerly the Bankside Power Station, Tate now has a modern art and contemporary art collection among the most extensive in the world. Similar to the Encina Power Station, the Bankside Power Station underwent construction between 1947 and 1963. Likewise, for years the developers tried to destroy it. However, a group of Londoners came together to save the iconic structure, while suggesting possible ways to repurpose the defunct structure. Finally, the Londoners prevailed with the Tate Gallery deciding to bring the Tate Modern to Bankside. Despite undergoing nearly no structural changes to the chimney, it remained so popular and central to the London landscape that the city would go on to spend 18.2 million pounds, about 30 million dollars at the time to build the Millennium Bridge as a direct pathway to the Tate.  
Forever Carlsbad.
"Even though I am not a Californian, I hope the Carlsbad CA, smokestack stays, for it is an iconic historical landmark, for Carlsbad CA, and it can be seen from sea, land, and air. It is also a testimony to the past, of the hard work, that past generations built, in American architecture heritage. We cannot lose old architecture heritage, for future unborn generations, need to see, what America has built, in the past, whether it be cars, houses, that smokestack, and so on. As a West Texan, who proudly lives in Carlsbad, Texas, our smokestack (which is a smaller smokestack, leveling out at 110 to 130 ft) has been in place, since the 1920s at the San Angelo State Supported Living Center, mental health facility, in Carlsbad, Texas. Our stack is an icon, and when I see our smokestack from Hwy 87, or from the sky, I know home is close by, and that is a good feeling. Keep fighting for your/our American architecture heritage."
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Sincerely/Respectfully, JD
Carlsbad, Texas