A passport valid for a minimum of three months is required for all foreigners entering the Czech Republic. US citizens do not need a visa to enter the country for up to 90 days. Visas for longer stays can be acquired prior to your trip by contacting the Czech Republic Embassy in Washington (http://www.mzv.cz/washington). You may be asked to provide financial records and medical insurance that covers you for a minimum of US $35,000: which can be done through a health insurance card or internationally recognized credit card with included insurance.
Health and Safety
There are few major health risks for travel to the Czech Republic, though there is a small risk of tick-borne encephalitis in rural and heavily forested areas during the peak summer months. There is a small chance of contracting rabies, and if bitten you should immediately seek medical attention. Immunization against hepatitis B is also advised.
As with any tourist destination, Prague has some problems with pick-pocketing, especially around its busy shopping areas and main squares. Stay extra vigilant around the Charles Bridge.