Built in around 1450, Rosyth Castle once stood on an island connected by a causeway to the north shore of the River Forth and could only be accessed at low tide. It's amazing to think that all the land surrounding the castle now has been reclaimed within the last century. With the relocation of nuclear submarines in 1993, a massive portion of the Royal Navy dockyard was sold off, including the land that the castle sits upon. As such, you cannot explore the castle but you can still admire it from nearby.