Aahz had told me that dimension-hopping was dangerous because a person could hop to an unknown dimension and never get back.

The narrow ravine hides the opening to a cavern of unknown dimensions.

My very sense of space was distorted and deformed as if some unknown dimension had somehow been mingled with those familiar to us.

Moreover, the Soviet Union has in recent years become a transit region of unknown dimensions.

Taking the transport into an unknown dimension or location in space to what might be a weapon to turn away the Great Evil.

In most fields, research is more akin to climbing a mist-shrouded mountain of unknown dimensions.

He could also summon demons from an unknown dimension to do his bidding.

In Balanchine's enchanted forest, the unknown dimension behind the real world is the subject.

We've had two oil shocks, a third one of unknown dimensions on the horizon.

According to some theories, the machine could see evidence for previously unknown dimensions, beyond the usual four, lurking right under humanity's noses.