Today is Sunday, and every "domingo", in Madrid may mean Rastro, of course this is if on Saturday was not done too late, or come to see the strength not to retire to sleep and make a single pull until the next day.
The rastro is a open market that invests the streets of "la latina", a famous district in the heart of Madrid, from about 6 am to 4/5 pm.
In addition to stalls where you can really find the thing: shoes, bags, glasses, toys, posters, jewelry, weapons, furniture, bicycles, stuff second-hand is a place where music and colors, people and food resonate throughout the neighborhood .
Here is a representative photo that this time I did not take (I was too tired and maybe a little drunk to remember to take a picture):

https://www.google.com/search?q=Rastro&source=lnms&tbm=isch&sa=X&ved=0ahUKEwiOxaXTqP_XAhUIrRQKHR3XAOsQ_AUICigB&biw=1396&bih=623&dpr=1.38#imgrc=veCyngv_vBq5mM:

I met a glasses player who intoned a beautiful melody (Harry Potter) that I then strangely met on youtube too; here is the link:

Go in search of strange and unobtainable objects, maybe you will find them!