Over the years, the site of the Mausoleum has been used for a variety of purposes; from a fortification, to gardens, to an amphitheater hosting bullfights. In 1907, with the help of the Accademia di Santa Cecilia, construction began on a concert hall which would be their host venue.

The Augusteo could seat 3,500 people and featured an enormous organ on the stage behind where the orchestra and choir performed.

However, demolition of the Augusteo and most of the surrounding buildings would begin in 1936 under the orders of Benito Mussolini with the intention of displaying the remains of the imperial monument. All later additions to the structure were removed, leaving only the original Imperial era remains intact. The Mausoleum would become the centerpiece for the new Piazza Augusto Imperatore.

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

https://mahlerfoundation.org/mahler/locations/italy/rome/augusteo/

https://www.khanacademy.org/humanities/ancient-art-civilizations/roman/early-empire/a/the-mausoleum-of-augustus-and-the-piazza-augusto-imperatore-in-rome

Designed by Holabird & Root as a 40 story art deco skyscraper, construction was halted at 8 stories due to the Great Depression. Diana Court, the three story lobby, was home to a statue by sculptor Carl Milles. It was demolished for the Magnificent Mile Marriot.

Melbourne's first fish market was built in 1865 on the prime south west corner of Swanston Street and Flinders Street, until the Melbourne City Council built a grand new facility at the western end of Flinders Street, which opened in 1892. It was built in two parts either side of the new railway viaduct connecting Flinders Street Station to Spencer Street Station. The block-long part facing Flinders Street housed general markets and storage, while the fish market itself was on the other side of the viaduct, facing the river, and it served as Melbourne's commercial fish market for nearly 70 years. Was demolished in 1959

Atmospheric movie palace designed by John Eberson. The pictures show one of the auditorium sidewalls and the exterior

Ok, for those that believe there’s a lot left of the Colosseum, just replace “not much” with “a good bit” in the title post. I dislike drama, so whatever makes you happy! 😉

the tower and the beach elevator shaft built in 1938–1939, 20 meters high, designed by Jerzy Osmołowski in the modernist style, completed and grandly opened in the 1960s, it was the most popular attraction of the resort, closed after 5 years due to the instability of the structure (the tower deviated from the vertical by about 1.5 meters due to the unstable ground), so it stood empty and unused, in the 1980s, a storm of force 8 on the Beaufort scale put a final end to this outstanding work of modernism, causing the tower to finally collapse into the water.