In the wake of China's decision to close Tibet's borders to all foreign travelers for the third time in less than a decade, here is a look at some other countries around the world who don't make it easy to get in. The roadblocks can range from complicated visas to civil unrest or unfriendly international relations. Whatever the reason, these destinations will require some serious planning ahead.

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tibet
A man drags a horse across the Tibetan mountains Reuters
russia
People walk along Red Square, with St. Basil's Cathedral reflected in a puddle. Reuters
North Korea
A North Korean soldier walks past from behind a fence on an island located in the middle of the Yalu River. The communist country broke off six country nuclear talks in 2008 but a diplomat is coming to the U.S. this week to explore resuming those talks. Reuters
TURKMENISTAN
The Karakum Desert occupies about 70 percent of the area of Turkmenistan Flickr
congo
Congolese soldiers patrol along a main road of the Democratic Republic of Congo's capital Kinshasa Reuters
Somalia
A Somali fisherman carries fish on his head as he walks along the streets of Hamarweyne Reuters
Saudi Arabia
Saudis wait for the arrival of Saudi King Abdullah at the 26th Janadriya Heritage and Culture Festival Reuters
Cuba
Americans have been restricted from traveling to Cuba since communist forces took hold of the country in 1959. Reuters
Cuba Russia Russia Russia