The world's skylines are constantly changing.
Some of the most historically stunning architectural gems are now gone forever, thanks to new constructions, natural disasters, and political conflicts.
While some were rebuilt or changed location, others are now only memories of the past.
We've put together a collection of breathtaking buildings that were once marveled at for their design and role in society.
Click through to see some of the most iconic hotels, businesses, theaters, and private homes.
SEE ALSO: 15 crazy facts about one of New York's most exclusive buildings
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The Hippodrome stood on 6th Avenue in New York City from 1905 to 1939. It was one of the largest theaters of its time, with a seating capacity of over 5,000.
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.
The Birmingham Terminal Station, in Birmingham, Alabama, was completed in 1909 and stood as a principal railway station for the city until it was demolished in 1969.
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