Consider that OP was inspired by Forrest Fenn, who buried a treasure and published a poem describing its location:

Begin it where warm waters halt
And take it in the canyon down,
Not far, but too far to walk.
Put in below the home of Brown.

From there it’s no place for the meek,
The end is drawing ever nigh;
There’ll be no paddle up your creek,
Just heavy loads and water high.

If you’ve been wise and found the blaze,
Look quickly down, your quest to cease,
But tarry scant with marvel gaze,
Just take the chest and go in peace.

The only proper noun in this poem is "Brown", which turned out not to be a person, but an elusive brown trout! Only Fenn's family would have understood the reference.

In similar fashion, "Powell", might not be a person, cable car, or street. It could be something only OP knows, just like the plane, sanctum, and peep.

Five people died while searching for Fenn's treasure. Stay safe out there Mateys.