The real answer is nobody cared enough to push the idea into the mind of the public, and, therefore, the public did not care enough to act upon it. Capitalism is merely another fragment of humanity's callousness.
To a small degree they exist. At least for the parents of said children. My kids’ school frequently asks for parent volunteers to go on field trip to help watch the kids.
Assuming you mean work-sponsored, they exist. My job usually does one (optional and workload permitting) like every six months. Outside of work...well if you're an adult nothing is stopping you from going to a museum or an old mill yourself.
Schedule a tour of your local water plant! Even small cities have interesting setups, and its in their best interests to give tours and build community trust.