Good afternoon.
We plan to take a day trip from Florence to Siena in June. We want to do the "Gates of Heaven" tour at the Siena Duomo but I cannot determine how to buy the tickets online. When I click on "Buy Tickets" on the Gates of Heaven page I'm connected to the ticket page for the OPA Si Pass but do not see an option to add the Gates of Heaven. I emailed the information center two weeks ago but have not heard back.
Any advice would be greatly appreciated. Thanks.