For those doing Imperial Cities, don't forget there is a entry requirement (even for tourist) for Prague. All must have medical insurance or trip insurance with medical that covers a minumum of $38,000, many basic travel insurance plans have a 10k limit. I am in the final planning stages of my trip next month and ABD does not tell you this information. I found it the info by accident and the below is copied and pasted from a response I received from the Czech emabassy when I inquired about this situation. I asked if travel insurance with medical was sufficient as I do not have medical insurance.
Please note that you are required to have a travel/health insurance to travel to the Czech Republic. Your health insurance must cover the medical services abroad - if not, you must have a travel insurance for possible expenses and hospitalization charges for medical reasons (accidents or unexpected illness while traveling in the Czech Republic),including repatriation to the country of your legal residence or to the country which issued your travel document. Minimum coverage of the insurance has to be at least $ 38,000. Make sure you will have a proof (for example: a letter issued by the insurance company, or a copy of the contract or any other document which will give the detailed information on the type and coverage of your insurance) of your medical insurance with you when entering the Czech Republic.
Please note that you are required to have a travel/health insurance to travel to the Czech Republic. Your health insurance must cover the medical services abroad - if not, you must have a travel insurance for possible expenses and hospitalization charges for medical reasons (accidents or unexpected illness while traveling in the Czech Republic),including repatriation to the country of your legal residence or to the country which issued your travel document. Minimum coverage of the insurance has to be at least $ 38,000. Make sure you will have a proof (for example: a letter issued by the insurance company, or a copy of the contract or any other document which will give the detailed information on the type and coverage of your insurance) of your medical insurance with you when entering the Czech Republic.