Traveling through dimensions, the past, or the future is a concept often explored in science fiction and theoretical physics. However, since such forms of travel are purely hypothetical at this time, there is no definitive answer on how someone would know their destination or recognize when they've arrived.
In fictional scenarios, authors often use creative devices to facilitate such travels. These can include time machines, portals, or advanced technologies that guide individuals to specific destinations. In these narratives, characters may have instruments, coordinates, or some form of guidance to determine their location or arrival.
In reality, if such travel were possible, it is speculative as to how one would navigate or recognize their destination. The fundamental nature of time, space, and alternate dimensions is not yet fully understood, and there are no established methods for interdimensional or time travel.
It's important to note that the concept of traveling through dimensions, past, or future remains largely theoretical, and scientists are still exploring and investigating these ideas. As our understanding of the universe expands, future discoveries may shed light on the possibilities and mechanics of such travel.