Only the Ryfast tunnel at Stavanger in Norway is longer ... illuminated roundabout surrounding a giant central pillar of natural rock, left behind during the blasting constructions.

Following delays, Norway is pressing ahead with plans to build the world’s first full-scale ship tunnel. It should boost tourism along the coastline.

Here's what the site had to say about Ohio's most breathtaking natural attraction: "A tunnel-like cave situated high up on a ...