It had to happen.

In addition to the various and sundry tours of Florence, we have a semi-new option:

The Dan Brown Inferno Tour.

Not to be confused with Dante’s Inferno.

Though in 2014, especially in English, Dan Brown’s “Inferno” might be better known than that other guy’s “Inferno”.

The “other guy” being Dante Alighieri, who 700 years ago wrote the Divine Comedy (of which “Inferno” is the first part), a collection of writing often considered “one of the greatest literary works of human kind”.

Dan Brown has not produced a great literary work, not in several tries, but he is one of those writers with the ability to keep readers turning pages. The New York Times described his latest book as another of the “scavenger hunts” Brown does so well, but the Independent, a British newspaper, wrote: “Brown’s fusion of gothic hyperbole with a pedant’s tour guide deliberately restrains the imagination through its awkward awfulness.”

And now his books (Angels & Demons, The Da Vinci Code) are being made into movies.

Much of Inferno is set in Florence, and the Palazzo Vecchio museum now offers a tour of several of the sites where Robert Langdon, the tweedy protagonist, spends his time while trying to figure out another … scavenger hurt.

Is it worth seeing?

Actually, yes.

For about $15 each a guide will take your group into some odd places inside the palazzo.

You can see how the artist and architect Vasari lifted the original roof, creating a sort of crawl space that comes up in the book.

You will be shown a series of mysterious letters from one of the enormous works of art on the wall of the enormous Room of 500.

You will enter the palazzo through a “secret” door. And you will be shown the exit/entrance to the Vasari Corridor, an overhead “tunnel” more than half a mile in length leading from the Pitti Palace, on the other side of the Arno River, over the Ponte Vecchio and into the Uffizi and, finally the Palazzo Vecchio.

Perhaps the single coolest part of it is the map room, where an entrance is hidden behind the map of Armenia. (It is a bit cool to watch the other tourists in the room gape as you and your small group swing the map open, and disappear into another room.)

And, at the far end of this new series of room is an elevated spot with a slit through which a spy can watch (and listen to) what is being discussed by the “500” down in the great room below.

It helps to have read Dan Brown’s book just before you do to the tour. Like, the week before. Because his is the sort of fiction that leaves no mark on the mind, and this or that part of the chase (including the misnamed Dante death mask which yields a clue) … may well be foggy inside your head if you read the book a month ago.

It is a curious building, an old one, and the tour takes a person into parts regular tourists do not see — and may not care all that much about, if they are not a reader of Dan Brown.

The museum can expect another surge of “Dan Brown Inferno” tourists in late 2015. The movie, with Tom Hanks again playing Robert Langdon, is due to come out in December 2015.