There are 16 Hidden History locations to find in Saints Row, and each of them gives you insight into Santo Ileso's past. They're among the many Discoveries spread across the map, in the same category as drug pallets, dumpster diving, and photo hunt opportunities.
To find these locations, you'll need to pass near them on the map, which means a lot of exploring if you don't have a guide to show you where they are. Hidden Histories are marked by gold icons with treasure chests in the middle. To see them, open your Map app, and tab over to "Discoveries."
Once you arrive at a landmark — Fort Cullen Route 66, or Go Kart Go!, for example — you'll need to find and interact with five green historical marker signs. You needn't listen to an entire audio file at one marker before listening to the audio file at the next marker for it to count, so you can run through these if you're not interested in learning more about Santo Ileso's lore.
Below, we've collected all the Hidden History locations, starting nearest the Saints Church HQ and moving counterclockwise. Completing each site gives you a bit of money and XP, and some locations are linked, giving more cash and XP along with new clothes for completing both areas.
Fort Cullin is at the big American flag 150 meters northeast of the Church HQ. You'll go here during the Office Decor quest to retrieve the cannon collectible and open the ability to place collectibles in the HQ.
Meeker Square is about 350 meters east/southeast of Fort Cullen. Look for the large statue in the center of a pioneer hanging from a cliff while being attacked by two panthers, a snake, and an eagle.
Beware the Grisly Bear is roughly 520 meters southeast of Meeker Square. Everything looks roughly the same in this area, so look for a corrugated metal building with a green roof and Cahlupacabra billboard near an overpass — and the large metal vulture shooting flames from its wings.
Rancho Providencia is in northern West Providencia, about 700-750 meters south/southwest of Beware the Grisly Bear. It's a western-themed shopping center in a small mountainous area on the right side of the road leading north from Jim Rob's Garage.
St. Thomas Corvacho is a church in mid-western East Providencia, about 700 meters southeast of Rancho Providencia and 300 meters southeast of Panther Rock. It's across the street from (southeast of) the Branded clothing store.
The Grand Prix is in West Providencia, just 190 meters southwest of St. Thomas Corvacho. Look for the yellow Rancho water tower near the church.
Frank's 80/20 Brewery is in the center of Smelterville West, about 1,075 meters southwest of The Grand Prix and 1,000 meters southeast of the El Dorado fast-travel location. Look for the large beer jutting into the skyline near the Scorpion factory and the Iles Oil factory.
Go Kart Go! is about 1,500 meters west of Frank's 80/20 Brewery and 500 meters west/southwest of the El Dorado fast-travel location. The track can be found directly west of/next to the Aztec casino and directly south of the Lancelot Castle.
Route 66 McQuarry is the cluster of buildings 150 meters south of the Lone Wolf fast-travel location in Badlands South.
Lake Alacran is in Badlands North, about 2,500 meters north/northwest of Route 66 McQuarry and 1,100 meters west/northwest of the Cactus Bill fast-travel location in Lakeshore South. Look for a small shack with a dock in a dry lake bed and a small dirt parking lot at a major intersection. There's a run-down farmstead with a windmill nearby.
Jasinski Park Library is the statehouse/capital building in Lakeshore South about 700 meters east of Lake Alacran and barely northwest of Jasinski Pavilion and the Cactus Bill fast-travel location.
Jasinski Park Theater can be found barely east of the Library, sitting between it and the Cactus Bill fast-travel location.
Red Faction Memorial Park is in the southeast corner of the Marina West district, about 2,262 meters northeast of Jasinski Park Theater and 375 meters south/southeast of the Bear Lake fast-travel location. It's across the street from St. Santa Lina Apartments along the main road that cuts through the district.
Sidewinder Creek is roughly 2,300 meters east of Red Faction Memorial Park. Look for a national park area with picnic shelters and tables, American flags, and a large boulder surrounded by towering mesas.
Sky Canyon is 200 meters southeast of Sidewinder Creek. It is the scenic overlook area directly across the creek.
Route 66 Cranston is located in far eastern portion of Rojas Desert South, more than 2,000 meters south/southeast of the Sky Canyon. It is an area that is comprised of a Ringers clothing store, Thunderpump gas station, Rock Shop Dinosaurs store, and a TacoSrus restaurant.
And those are all of the Hidden History locations in Saints Row. You won't get a trophy or achievement for your efforts, but you will be a little bit closer to achieving 100% completion — and plus you know all about Santo Ileso's weird past, which is perhaps the most interesting story-related content in the game. For more, head over to our Saints Row guides page.