To or other prepositions

No. Not at all.
"To" is not the only preposition available.
It depends on the context.

You can lead a horse to water, but you can't make it drink.
He led the captives through treacherous terrain.
We were sent from the New York lab to the Chicago facility last week.

My sentences, were given without any context at all so I will use either of them.

The captives were led in/into/to a huge/large hall.
We were sent in/into/to the laboratory two days ago.

Thanks

1. Only into or to are possible here. Either large or huge is okay. "The captives were led into a large hall." emphasizes the entering into the hall phase of the movement. "The captives were led to a large hall." emphasizes the movement to the hall.

2. Only into and to are possible here. "We were sent into the laboratory two days ago." implies that the people were sent into the lab