Generally a visa is required to enter Mongolia, but if you are an American citizen all you need is your passport for visits less than 90 days. Be aware that if you are planning on staying in Mongolia for more than 30 days you need to register with the Office of Immigration, Nationalization, and Foreign Citizens in Ulaanbaatar within the first seven days of your visit. Failure to do so will result with you being stopped upon exiting and being issued a fine. Also, visitors to Mongolia that do not carry a visa are subject to a tax upon departure.
 
Visa regulations have recently changed in Mongolia and now it is no longer possible to purchase a visa upon entering Mongolia. All visas must be purchased ahead of time. When acquiring a visa you will need a passport that is valid for at least six months, the visa application form, and a passport size photo. The standard charge for a tourist visa is $25 USD.
 
For the most current visa information, please visit the official Embassy of Mongolia website:

http://www.mongolianembassy.us/english

Cultural Crossroads Tours of Mongolia at a Glance

• Mongolia: Cultural Landscape and Diversity
  

  Join Cultural Crossroads for a cultural trip to Mongolia, a country with ancient Tibetan-Buddhist traditions, monasteries and friendly spiritual people. Meet lamas, hear the low tones of the horns used to call the lamas to the temple and observe their daily rituals. Our travelers have special access to the Arts Council of Mongolia and its art collection. Meet local artists and crafts people. Enjoy the Hustain Nuruu National Reserve, home to the last remaining species of wild horse, the Takhi. Learn about current conservation efforts and the status of the herds found within the reserve. We will see the Kharakhorum, site of the 13th-century capital of the Mongol Empire of Chinggis Khan. Take in the remote and stunning wilderness of Mongolia when we stay in South Gobi, home to Bactrian camels, Argali mountain sheep, goitered gazelle, golden eagles, saker falcons, jerboas (similar to kangaroo rats) and many endemic reptiles. The Gobi is also home to some of the Northern Hemisphere’s rarest and most elusive mammals such as the dhole, snow leopard, wild camel, and Gobi bear. Cultural Crossroads travelers will stay at the Three Camel Lodge in gers (Mongolian tents), an eco-lodge located near the Gurvansaikhan Gobi National Park. Our trip ends with a visit to a nomadic family leading a local movement to protect and preserve the Bactrian camel populations