Many people have dreams of seeing the entire world - but it's not always that easy. Some countries are dangerous or even illegal for certain foreigners to visit. 

Many people have dreams of seeing the entire world - but it's not always that easy. Some countries are dangerous or even illegal for certain foreigners to visit.

Learn More: Alerts and Warnings <a href="http://travel.state.gov/content/passports/english/alertswarnings.html">http://travel.state.gov/content/passports/english/alertswarnings.html</a> "We issue a Travel Warning when we want you to consider very carefully whether you should go to a country at all. " FCO travel advice mapped: the world according to Britain's diplomats <a href="http://www.theguardian.com/news/datablog/2011/mar/23/fco-travel-advice-map">http://www.theguardian.com/news/datablog/2011/mar/23/fco-travel-advice-map</a> "The world is a scary place right now; what with the Japan disaster and the Arab and Middle East unrest." 10 countries Americans need advance visas to visit <a href="http://gadling.com/2011/08/17/10-countries-americans-need-advance-visas-to-visit/">http://gadling.com/2011/08/17/10-countries-americans-need-advance-visas-to-visit/</a> "We live in an increasingly borderless world and we have access to many countries that were closed (or non-existent) 20 years ago." Henley &amp; Partners <a href="https://www.mycbs.biz/data/ranking-de-pasaportes.pdf">https://www.mycbs.biz/data/ranking-de-pasaportes.pdf </a>

Which Countries Can't You Visit?

Watch More: <a href="http://skr.cm/1KLxrke">Which Country Has The Most Casual Sex? </a>

Watch More: <a href="http://skr.cm/1KLxrke" target="_blank">Which Country Has The Most Casual Sex? </a>

Earth & Conservation

Many people have dreams of seeing the entire world - but it's not always that easy.

What if you could turn Mars or Venus into another Earth?

What Would It Take to Terraform Other Planets?

The idea of controlling the weather sounds like an evil plan hatched by a James Bond villain, but it’s closer to reality than you might think.

Controlling the Weather Isn’t Science Fiction

If you think the weather forecast is always wrong, well then we’ve got news for you.

Why Is the Weather So Hard to Predict?

Fermentation is a natural process that humans have been hacking for millennia.

Your Next Burger Could Be Made With Microbes

Recent biodiversity reports point to a drastic drop in species across the world, but on the local scale the results are more mixed.

The Missing Pieces in the 6th Mass Extinction

Recently, researchers found that under the right conditions, light can behave like a liquid that flows in unison.

This Exotic State of Light Acts Like a ‘Liquid’

What will the future of archaeology look like?

This is the Future of Finding Lost Civilizations

We’ve learned so much about ancient humans through archaeology over the years but this feels like a good time to talk about whether we should be digging up ancient people and the objects that once supported their livelihoods in the first place.

The Controversial Dark Side of Archaeology

Ultimately the goal of archaeology is to find out about historic humans and their lives.

How Do Archaeologists Know How Old Things Are?

As more of the world’s forests are destroyed, it makes you wonder: what’s going to absorb CO2 in their place?!

This Forgotten Ecosystem Holds Twice as Much Carbon Than Forests

Researchers may have miscalculated soil’s ability to capture carbon...meaning our current global climate models might be off.

Can Soil Actually Capture Carbon? Maybe Not

After a decade of research and development, China is ready to test its first-ever thorium-powered molten salt reactor.

The Next Generation of Nuclear Power Is Here

After a decade of research and development, China is ready to test its first-ever thorium-powered molten salt reactor. If it runs safely and shows potential to be cost-effective, China may be powering over a hundred thousand homes by 2030.

Which Countries Can't You Visit?

According to the U.S. State Department, American citizens should think twice before visiting certain regions. So which countries does the U.S. have listed?