An estimated 900 people worked on Carnival Row during its production in Prague, the majority of them local. Only about 60 cast and crew members were brought into the country for filming.
One of the most expensive projects to ever shoot in the Czech Republic […], Carnival Row spent an estimated 1.5 billion CZK (roughly $75 million) while in Prague.
The production was granted a tax rebate of more than 250 million CZK.
While filming primarily took place at Barrandov Studios in Prague, production also took place at locations in Liberec, the chateaux in Frýdlant and Krnsko, and Prachovské skály, the majestic natural rock formation […].
Carnival Row was originally sold as a spec script by Travis Beacham all the way back in 2005, and passed through the hands of directors like Guillermo del Toro […] and Neil Jordan at various stages of its development.
Directors Paul McGuigan (Lucky Number Slevin), Jon Amiel (Copycat), Andy Goddard (Set Fire to the Stars) and Anna Foerster (who shot Underworld: Blood Wars in Prague in 2015) each worked on the series in the Czech Republic.
(Source: The Prague Reporter)