Black and white photograph of a stream under a structure in a mountainous forested area, location unidentified. Ed Yourdon's notes: "This seems to be a pretty significant dam, but it's another mystery: I don't know where it is, nor when the photo was taken, nor who took the photo." The structure may not be a dam but a road, as there is no room for a reservoir in the canyon above
Black and white photograph of four people on a hike in a mountainous setting. Ed Yourdon's notes: "...
Black and white photograph of a small building and a tent, possibly an early property associated wit...
Black and white photograph of a landscape with a prominent bluff, possibly made of sandstone and lik...
Black and white photograph of a stream under a structure in a mountainous forested area, location un...
Black and white photograph of a waterfall, possibly in Colorado. Ed Yourdon's notes: "Mystery water...
Black and white photograph of a mountainside with steep cliffs and a tall, narrow waterfall, possibl...
Black and white photograph of a scene with waterfalls coming off of a plateau, possibly at Thousand ...
Black and white photograph of a mountain road with a tunnel through a hill. Ed Yourdon's notes: "My...
Black and white photograph of a woman rafting on a reservoir. Ed Yourdon's notes: "I have no idea w...
Black and white photograph of tents set up in a campsite during one of the Yourdons' travels. Ed Yo...
Black and white photograph of tents set up in a campsite during one of the Yourdons' travels. Ed Yo...
Black and white photograph of tents set up in a campsite during one of the Yourdons' travels. Ed Yo...
Black and white photograph of people fishing by a lake, location unidentified. Ed Yourdon's notes: ...
Black and white photograph of four people on a hike in a mountainous setting. Ed Yourdon's notes: "...
Black and white photograph of a small building and a tent, possibly an early property associated wit...
Black and white photograph of a landscape with a prominent bluff, possibly made of sandstone and lik...
Black and white photograph of a stream under a structure in a mountainous forested area, location un...
Black and white photograph of a waterfall, possibly in Colorado. Ed Yourdon's notes: "Mystery water...
Black and white photograph of a mountainside with steep cliffs and a tall, narrow waterfall, possibl...
Black and white photograph of a scene with waterfalls coming off of a plateau, possibly at Thousand ...
Black and white photograph of a mountain road with a tunnel through a hill. Ed Yourdon's notes: "My...
Black and white photograph of a woman rafting on a reservoir. Ed Yourdon's notes: "I have no idea w...
Black and white photograph of tents set up in a campsite during one of the Yourdons' travels. Ed Yo...
Black and white photograph of tents set up in a campsite during one of the Yourdons' travels. Ed Yo...
Black and white photograph of tents set up in a campsite during one of the Yourdons' travels. Ed Yo...
Black and white photograph of people fishing by a lake, location unidentified. Ed Yourdon's notes: ...
Black and white photograph of four people on a hike in a mountainous setting. Ed Yourdon's notes: "...
Black and white photograph of a small building and a tent, possibly an early property associated wit...
Black and white photograph of a landscape with a prominent bluff, possibly made of sandstone and lik...
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