This started off as curiosity about the exact path of the fabled solar eclipse of 1999 (Saros 145 (http://eclipse.gsfc.nasa.gov/SEsaros/SEsaros145.html) Member 21 (http://eclipse.gsfc.nasa.gov/SEsearch/SEsearchmap.php?Ecl=19990811)), but that got me thinking about whether or not "Dracula's Castle" as it exists within the real world and/or Bram Stoker's novel can be found along the path of total eclipse, and whether "Dracula's Castle" as it exists within the Castlevania mythos can be identified with that castle.
First things first, I recommend taking a look at the second eclipse link above; you'll find that not only does the path of total eclipse pass right over Romania, but the point of greatest eclipse (the "GE" marker on the NASA map, 45.0759°N 24.2983°E) is right in the middle of modern-day southern Romania -- i.e., Wallachia. That grabbed my immediate attention and I believe the point of greatest eclipse may have some bearing on the location of the castle.
Anyway, from what I know, there are four castles within the real world and Dracula that can lay claim to the title of Dracula's Castle:
A fictional castle atop Mount Izvorul Călimanului
Location: 47.1342°N 25.2886°E
Length of total eclipse: N/A
Distance from greatest eclipse: 241 km
(https://castlevaniadungeon.net/forums/proxy.php?request=http%3A%2F%2Fi.imgur.com%2FvNjj2dK.jpg&hash=a44e4e56a1980e3412db41b56048da1bf880089a)
Bram Stoker's research notes and modern maps have revealed this to be the location of Dracula's Castle in Dracula. Since there's never been a castle at that location, the castle is entirely fictional. It also falls well outside the band of total eclipse and isn't even close to the point of greatest eclipse. That being said, since there's nothing to suggest that the character Dracula in Dracula was actually Vlad III -- but rather any given noble from the House of Drăculești -- and since Castlevania has a closer connection to Dracula being Vlad III with Dracula's Curse taking place in the year of Vlad III's death (1476), Dracula is very clearly outside the Castlevania canon (the Morrises be damned) and this castle is very clearly not Dracula's Castle in Castlevania.
Castelul Corvinilor (Corvin Castle)
Location: 45.7492°N 22.8883°E
Length of total eclipse: 131 seconds
Distance from greatest eclipse: 133 km
(https://castlevaniadungeon.net/forums/proxy.php?request=http%3A%2F%2Fi.imgur.com%2FwFUhQpW.jpg&hash=93b70b13b786623920279b5a33ca3fa0b40b92cd)
Of the four castles this has the longest length of total eclipse, only 12 seconds shorter than the greatest eclipse. But the connection to Dracula is tenuous: after being routed by a combination of the Ottomans, his younger brother Radu, and his former boyars, Vlad III went west to Hungary to seek help from Matthias Corvinus (yeah -- that guy), who betrayed and imprisoned him in Corvin Castle to stay out of war with the Ottomans. History isn't even particularly clear on how long he was imprisoned there. Very poor connection altogether despite being right on the path of total eclipse.
Castelul Bran (Bran Castle)
Location: 45.5150°N 25.3672°E
Length of total eclipse: N/A
Distance from greatest eclipse: 97 km
(https://castlevaniadungeon.net/forums/proxy.php?request=http%3A%2F%2Fi.imgur.com%2FFlq9k3j.jpg&hash=9c6386b0a44cc3d1b3e89b00860e3d5445fd49c6)
This is a tourist trap and doesn't seem to have any special connection to Dracula apart from Vlad III spending occasional time at the castle. And it's not even in the path of total eclipse despite being reasonably close to the point of total eclipse.
Cetatea Poenari (Poenari Citadel)
Location: 45.3537°N 24.6352°E
Length of total eclipse: 102 seconds
Distance from greatest eclipse: 41 km
(https://castlevaniadungeon.net/forums/proxy.php?request=http%3A%2F%2Fi.imgur.com%2F83xmqcr.jpg&hash=6f20bb6b197770c445db191f7c99fb2181d95e21)
Poenari, ironically, is more of a citadel than a castle, but the military ramifications of that may reflect well on the Dracula of Castlevania. At 102 seconds the length of total eclipse is shorter than that at Corvin Castle -- but still more than long enough for the forces opposing Dracula in the Demon Castle War to "do something" to seal the castle inside the eclipse. And it's only 41 km (about 25 miles) from the point of greatest eclipse. Furthermore, it has the strongest connection to Dracula: though built in the 13th century, Vlad III himself rebuilt and strengthened the clifftop fortress of Poenari early in his reign, and it served as his stronghold during the war with the Ottomans I mentioned above. Everything points to Poenari being "Dracula's Castle."
Of course there's nothing to suggest that the castle sealed inside the 1999 solar eclipse is even a castle that exists -- in reality or fiction -- outside Castlevania. But it was fun to find out that, without any further information, everything points to that being logically feasible.