Today - no. In the past - yes.
Romania is not in any country. Romania is itself a country. It is in the continent of Europe.
The word "on" could be a preposition, as in "they went on an expedition" but would be an adverb in the example "unable to turn back, they went on" (no object). In any case, went is NOT a preposition,: it is a verb, the irregular past tense of the verb "to go" (past participle gone).
Romania hasn't volcanoes.
Any Miss Romania in 1938.
Any dragons discovered in Romania !
Romania has no true deserts so has no desert land forms.
Anything which has been done in past but yet not finished, for this we use present perfect like He has gone to while for any actions which take place in past and is finished , for that we use simple past like He went to.
Any circus maximus in Romania.
Of course, the Carpathians - about 30 % of the Romania area.
Any serious predictions exist in Romania.
Romania has the Carpathian Mountain ranges.