The Romanian government has now placed an $80 million (Rs.470 crore) bid to buy it, according to media reports.
Though the fictional vampire never lived in this castle, Bram Stoker, the author of 1897 novel Dracula, chose to give Dracula a home that matched Bram castle in description.
Take a video tour of Bran Castle
"Bram Stoker never visited Romania. He depicted the imaginary Dracula's castle based upon a description of Bran Castle that was available to him in turn-of-the-century Britain," read a statement on the Bran Castle website.
"Indeed, the imaginary depiction of Dracula's Castle from the etching in the first edition of Dracula is strikingly similar to Bran Castle and no other in all of Romania," it said.
In the novel, Stoker describes the fortress as sitting high above a valley, perched on a rock above a flowing river.
This castle is the only such fortress in Transylvania that fits the bill, the Bran Castle website noted.
When creating the character of Dracula, Stoker drew inspiration from a real-life man with an apparent taste for blood - Vlad III, Prince of Wallachia, modern-day Romania.
Also called Vlad the Impaler, the prince seemed to have a fondness for impaling his enemies.