I know. “The Chesapeake Bay Bridge-Tunnel.” Yawn. Sounds really exciting, right?

But take a look at it!

It’s a bridge that becomes an underwater tunnel, and then goes back to being a bridge again while still in the water.

Pretty amazing, huh?

The Chesapeake Bay Bridge-Tunnel is located about three hours from DC. It was built to give travelers an easier way to get across the bay from Virginia’s Eastern Shore to the rest of the state. When the structure opened in 1964, after four years of construction, it was hailed as “one of the seven engineering wonders of the modern world,” according to the Washington Post .

I agree. And I’m clearly not the only one who thinks it’s so cool! The bridge-tunnel even has its own Facebook page with more than 5,000 fans, where you can see someВ amazing photos.

Other cool bridge-tunnels to check out: the Oresund, which connects Sweden to Denmark, and the Monitor-Merrimac, also in Virginia.

(Images via the Chesapeake Bay Bridge Tunnel)