These can both be queued:
1. Construction Queue: While a building is under construction, you can add another building to the queue. When the first building is complete, construction on the second building will begin automatically
2. Research Queue: While researching a technology, you can add another technology to the queue. When the first technology is complete, research on the second technology will begin automatically
3. Patrons can queue an additional three technologies and buildings
4. Buildings cannot be queued in your capital city
5. Research and Construction queues will be cancelled if there are insufficient resources