What's extremely offensive in your country, that tourists might not know about beforehand?

This question was brought up a few day's ago on Reddit.  Some answers that were mentioned that tourist need to know are:

Thailand, Don't touch people on their heads, it is the highest point of the body so therefore it's the most respectful part. Also never point your feet at a Buddha statue, it's considered very rude.

Also, if you step on money, you'll be thrown in jail, it has the king's face on it and disrespecting him in anyway (like stepping on his image or saying you hate him) will get you a 1 way ticket to a not very nice prison.

When I lived in the Middle East showing the bottom of your feet (like when your legs are crossed) was offensive, saw expats do it all the time though

In Brazil,

The "OK" thing americans do with their hands means 'fuck you' 'Shove it up your ass'. So don't do it.

Ronald Reagan committed the same mistake.

In Germany, doing the Hitler greeting, saying 'Heil Hitler', and the Swastika are illegal here. It's very obviously very inappropriate to visit Germany and pose with your right arm raised for photos, especially when visiting a historically or culturally important place, and yet tourists keep getting into trouble because of this.

When you visit a foreign country be sure to research the local culture so you don't offend any one. You're representing your country, make sure you leave a good impression. 
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13th floor

Jet-Setter's, how many of you have seen a 13th floor at a hotel? Leave in the comments where and if you can, pictures.

Many hotels in the U.S. don't have a 13th floor. More travel supersitions around the world. https://t.co/29L5qyyOqN pic.twitter.com/OIBDjLJedg

— Yahoo Travel (@YahooTravel) February 1, 2016

Travel apps

The travel  guide used to be a medium-sized, thick book that you would have to find space for in your already packed carry-on. Most of the time it would get ripped or worse lost at one of your layover airports because you had to take it out to get to something else and forgot to put it back in. Well, now in the day's of the smart phone or tablets, you can have a travel guide for every country and city you visit at the same time. Here are some apps that might be of interest for your next trip. 

These are all on the Google Play store for Android phones and tablets, but they all, also, have iOS (iPhone/Ipad) equivalent. Happy travels and stay safe. 

Traveling to the USA