To which countries can you travel?

There is a bunch of things to consider when evaluating to which countries you can and can not travel. Here I try to summarize the main ones.

Timezones

If you have to work for example during EU or US office hours that automatically rules out part of the world.

Long story short: If you work EU office hours and you want to sleep during the night the furthest east you can go is Japan/Eastern Indonesia/Western Australia outside of Winter Time. The furthest west you can go is during Winter Time most of South America (Outside of Winter Time eastern South America).

Tip: On Google you can type "[time] in [countryA] in [countryB]" meaning "when it is time in countryA, what time is it in countryB?"

Visa rules

Realistically you will have to check each country individually by hand, but to get a general (imperfect) idea you can check one of many 'Passport Strength' websites. Here is for example a link to one such site for someone with a Slovak passport.

Once you know a specific country you're interested in there are two resources I would recommend checking:

• A Timatic backed website. Timatic is the system that airlines use to determine whether they will allow you on their plane with the documents you have. You can't (easily) use Timatic directly, so we typically use this Emirates portal for it.
• Secondly Wikipedia has decent articles about the visa policies of many countries with links to authoritative sources.

Safety

Safety is hard to judge, and everybody has a different idea of acceptable risk. Regardless, there is probably for everyone places they would rather not go. The easiest way to get a general feeling for where you probably should and shouldn't go is by checking the travel advisory maps published by various national governments. Note that political interests definitely do affect how these maps end up looking.

• Here is the one by the Dutch government
• Here is the one by the US government

Internet quality

I have not found a single reliable resource that gave a good idea of how the internet was going to be in a country. Many websites will claim to give average internet speeds, but in our experience they weren't able to give a good idea of what to expect. The best strategy we developed so far is to open a bunch of random hotels on booking.com and filter the reviews on the word 'wifi'. The number of reviews complaining about the wifi was in our experience the best predictor of how good the mobile internet was going to be. Note that in countries with a lot of people complaining about the Wifi the mobile internet often was more stable than accommodation Wifi.

Forbidden goods

Probably not relevant for most people, but if you're carrying around a drone you won't be allowed to enter some countries. I have not found a good source of the full list of such countries.