Is There a Gravitational Wave Observator?

In 20 15, scientists detected gravi ational waves coming from two black holes colliding. And they could potentially detect gravitational waves from right after the big bang. So we need to have a gravitational wave observatory where the two ends of it are a million kilometers apart. But really, there's no perfect or universal telescope. You can build a telescope that's great at one thing, but it'll probably be lacking in something else.