The exhibition, the first of that kind here, marks the 30th anniversary of the 1989 Velvet Revolution.
For almost a year, mainly American and British pilots created a lifeline to support war-ravaged West Berlin, then encircled and blockaded by Soviet forces, with food and fuel.
Troops from the Warsaw Pact, a military alliance formed in 1955 between the Soviet Union and seven Eastern European nations, invaded Czechoslovakia on August 20, 1968 to crush liberal reforms enacted in the brief era known as the Prague Spring.
It has been 25 years since Czechoslovakia split into two autonomous states, Czech Republic
Only a year ago, the US and Cuba were embarking on a new era of friendship. Now that seems to have been put on hold.
The new investment in the Mariel special development zone will produce coffee and other food-related products if the deal is successful. The zone is part of Cuba's drive to update the centrally planned economy under President Raul Castro.
Thousands of Cubans each year try to cross into the US by land or sea. More than 46,500 Cubans have been admitted to the United States without visas in 2016 alone.
Cuban Foreign Minister Bruno Rodriguez calls Obama's visit 'an attack' on country's history
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