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"Adónde" is a form of "adónde", an adverb which is often translated as "where". "Viajar" is an intransitive verb which is often translated as "to travel". Learn more about the difference between "viajar" and "adónde" below.
viajar(
byah
-
hahr
)An intransitive verb is one that does not require a direct object (e.g., The man sneezed.).
a. to run
El metro viaja hasta las dos de la mañana los sábados.The metro runs until two in the morning on Saturdays.
adónde(
ah
-
dohn
-
deh
)An adverb is a word that describes a verb, an adjective, or other adverbs (e.g., to run quickly, very tired).