At the risk of repeating a perennial reddit favorite, I'm going to suggest that you check out Umberto Eco's Foucault's Pendulum if you're up for a more complex & challenging look at some of the same themes in Dan Brown's "Da Vinci Code."

The basic premise is that a bunch of history afficianados, in the course of bullshitting after work, make up a bogus but believable conspiracy theory about the Knights Templar. The conspiracy theorists of the world take to the story as literal truth, refuse to believe that it's bullshit, and start hunting down the guys that made it up in order to force them to reveal their "secrets."

Lots of historical background and a great meditation on the nature of belief and why people like to believe in conspiracy theories.

At the other end of the spectrum, if you want something light to read on vacation in the Dan Brown vein, you might check out some of the quasi-historical mystery/thrillers by Preston & Child -- they aren't great works of literature, but they are expertly-plotted Indiana Jones-style adventures that are very hard to put-down. I'd suggest this one, this one, or this one.

u/lifeviasatellite · 1 point r/todayilearned

There's a decent novel based on this idea that's got some treasure-hunting-supernatural-ness to it--I haven't read it in years, but I remember it being pretty entertaining.

u/Stacksup · 1 point r/history

Douglas Preston wrote a fiction book based on this called [Riptide.]
(http://www.amazon.com/Riptide-Douglas-Preston/dp/0446607177) Its low on historical accuracy, but a pretty good read if you are into that sort of thing.

u/ElBasham · 1 point r/canada

The guys who wrote "The Relic" also wrote a mediocre book (fiction) based on this thing.

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