it looks to me like the Coliseum could be fixed up and put useThat sounds like a good idea. That thing was well built, barrel vaults stacked on one another, shrinking toward the center, and other than modern plumbing and an arena floor over the old staging areas, and possibly a restoration of the big shade over the crowd, it seems doable. The paintings from prior to 1900 show trees growing on the top, and it's probable there was other growth all through it, so it would need a good look from engineers. But even so, a fully restored arena could make for even better tours.
I think people appreciate old buildings and stuff when they are still in use. Its like a pride thing. Also ties people more tightly with their heritage and identity.
Yeah well my country’s capital building is 2,000 years older than yours! nah nah nah nah nah!