An excellent site I recently discovered is the David Rumsey Map Collection.
"The David Rumsey Map Collection was started over 25 years ago and contains more than 150,000 maps."
"Digitization of the collection began in 1996 and there are now over 21,000 items online, with new additions added regularly. This site is free and open to the public."
"The historical map collection has over 22,000 maps and images online. The collection focuses on rare 18th and 19th century North American and South American maps and other cartographic materials. Historic maps of the World, Europe, Asia, and Africa are also represented."
Browsing the site I found the map entitled "Bohemia, Moravia, and Austrian Silesia" published in 1895. This was the exact time frame that my ancestors resided in the area before immigrating to the United States.