REYKJAVIK, Iceland (AFP) — In a dark auditorium in Reykjavik, bubbling orange lava flows down a slide to within inches of awe-struck visitors.

The flow, contained on both sides by black sand, lights up the room like a sunrise.

This is the Lava Show, Iceland's latest tourist attraction, that uses reheated lava from a real eruption of the island's Katla volcano more than 100 years ago.

The heat emanating from the molten rock is tangible, so much so that some of the spectators shuffle in their seats to remove their coats.

"This is the show where you get to experience real molten lava flowing inside of a building, intentionally," the Lava Show's Scottish host Iain MacKinnon joked.

The molten liquid sizzled as it hit blocks of ice, crackling like the sound of breaking glass as it cooled.