What is the tallest Tripod on the market

[ted_kennedys_liver]

I seem to recall seeing a 17' or 18' tripod for sale recently but can't find anything like it now. Can any of you recall any tripods out that are over 17' ? Thanks

[sneaky freak]

I was gonna say 16' but could be wrong, I dont think i would want to be higher than that in a tripod that's just me