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Can you just walk in? Or do you need tickets? I see there are free tickets but they're sold out.

Yeah you need tickets for the greenhouse. They're usually sold out for a few days ahead. You don't need a ticket for the rest of it though!

Thank you!

If you take the paid architecture tour, it does have a stop in the greenhouse, but the lights might be off/emergency lighting only.

That's probably fine if it's in the day, no?