Traveling from US to Romania to meet girl met online

My son, who is 22 years old, told me today that he plans on traveling from the US to Romania to meet a girl he met online. I immediately told him he’s crazy and there’s no way that’s happening. Needless to say, that wasn’t received well. He is adamant about going. The girl is supposedly 24 years old and lives with her brother. He told me They have video chatted, so he’s telling me she’s real. My gut tells me something isn’t right. Any thoughts or advice would be greatly appreciated.