I would go into the future because I want to see how the world will havehas changed. I would go into the future because I want to see how the world has changed.

どちらも正しいですが、このほうが自然と思います。

There isweren't a jet airplanes or the Internet 100 years ago. There weren't jet planes or the Internet 100 years ago.

(The speed of) technology development is so rapid, soif I went into the future, I cwould be able to see incredible things and technologies in the future, which I can't predicty that I could never have imagined. (The speed of) technology development is so rapid, if I went into the future, I would be able to see incredible things and technology that I could never have imagined.

"could never have imagined"="beyond my imagination/wildest dreams" Predictはいい言葉ですが、もう「未来にすごい技術があるはずだ」を予測したので、「it's unpredictable」（予測できない)はちょっと...

I also want to check the answer comparingsee how much it differs to the future that we imagine now. I also want to see how much it differs to the future that we imagine now.