is a particle used when describing a place that someone or something is ‘moving toward’, or ‘in contact with’. In many cases, the particles に
are interchangeable, but there is a slight difference in meaning. へ
focuses more on the distance/effort required to get between (A) and (B), while に
focuses more on the connection between (A) and (B). へ
always comes after the noun signifying the destination.
In these examples, while they may seem the same at first glance, へ
shows that there is a space between (A) and (B), while に
puts the emphasis solely on the destination. This is why common expressions such as ‘city/country name へ
ようこそ’ sound very polite. It is like saying ‘Welcome, and we acknowledge your journey/effort to get here’.
Welcome to Osaka!
Welcome to BPR News.
In the TV-show example, this commonly means ‘thankyou for your effort to watch this particular show, out of all the ones you could have chosen’.