That's interesting.
Example: The play is very interesting, but unfortunately also very expensive.
That's interesting. Example: The play is very interesting, but unfortunately also very expensive.
Das ist interessant. 
Det är intressant. 
See on huvitav. 
Tas ir interesanti. 
Tai įdomu. 
Det er interessant. 
Tämä on mielenkiintoista.