Don't try this at home...

Eldorado Springs,  Colo.    Ivy Baldwin on the Tight Rope.
Height, 582 feet.   Length, 530 feet.

This old card, mailed in 1913, documents the daredevil tightrope walk made by Ivy Baldwin, who crossed Eldorado Canyon in 1906.  Eldorado Canyon is a short distance above Boulder, Colorado.  They apparently had a heyday in the early 1900's with resorts in the area.  Ivy Baldwin was profiled by Life Magazine when he returned at age 82.