score:7
It's bureaucratic and complicated. (It's India!)
Each of the sites has a ticket, plus there's also a levy, and you need to pay both to get in. Each ticket is valid for one entry to that site only, and seems to be standardized at Rs 250 per site. The levy varies in value between Rs 10 and 500, but if you pay the maximum levy for the Taj Mahal, it's valid everywhere else as well for the same day only.
Examples: