I use an app called Gymsurfing. Works pretty well, gives information about location, pricing and equipment of gyms that allow walk-ins.
I've really been struggling with this. I travel continuously. Seriously - as in I have no home base and travel with just what fits in my day bag.
The single biggest thing I miss about giving up a home is my basement gym. Well, the girlfriend was pretty cool also...
I travel all over the world, so free weights/barbells are occasionally available, but far from reliable.
I've tried bodyweight stuff and it is okay to keep from from deteriorating too quickly - but honestly, it just doesn't compare to the barbell. Also, I don't really trust any progression that doesn't involve hard numbers in a spreadsheet.
In pure desperation, I have bought a sensor from Amazon that is used for weighing things like deer carcasses. The isometric/isotonic article from Starr has headed me down this route.
Using some straps and a hickory cane and a homemade iPhone app to read the sensor and beep at me (don't ask...) I have cobbled together an isometric/isotonic routine that is similar to an old article ascribed to Bill March. That, combined with chins/dips and 3 or 4 times a month finding a real gym and doing the real lifts is what I am trying now. It is desperate, but it is the best I can come up with short of consigning myself to a fixed domicile.
http://ditillo2.blogspot.com.es/2011...ill-march.html
For reference, I am 53 and would consider myself intermediate for my age. The iso stuff is definitely nothing to play around with. I don't recommend it for anyone that doesn't already have a firm grasp of the basic lifts.
In reading this, I see how ridiculous it sounds. The problem is that I can't figure out anyway to get all of the benefits of a barbell without a barbell. The closest that I can imagine is rigging up something with straps and a force sensor.