One of the most beautiful in the world is an underwater tunnel located in the Netherlands and called "Faleomar" tunnel. It connects between the Netherlands and the island of Flevoland, which is the largest artificial island in the world
Nice but I'd add a grotto and underwater stools on one side with a table for drinks and snacks. Plus one of the waterfalls would be coming from my hot tub, the slide would be covered in rock making it look like part of the grotto til the end
Gruner See (Green Lake) is a lake in Styria, Austria known for its shimmering, emerald-green hue and its fluctuating depth throughout the year, at times leaving a park completely submerged in it. The site has proven to be an attraction for divers, inviting them to plunge in and explore the spectacular underwater park, fully adorned with a bridge and a bench. There are even submerged trees in the crystal-clear waters that gives it a magical look. Photographer and diving enthusiast Marc…
This bridge and tunnel goes under water to allow movement of ships. In order for ships to pass, this bridge is half under the water. You drive down in the water and then come out on the other side. Truly a marvelous piece of engineering! This bridge is between Sweden and Denmark.
U.S. 1, Florida Keys Leaving the mainland for the 120-mile-long island chain of Florida’s Keys, travelers enter a paradise of beach bars, water sports, and Parrotheads (Jimmy Buffett fans). From Key Largo to Key West, the overseas highway strings the islands together like beads, running past lighthouses, underwater coral-reef parks, and across 7 Mile Bridge—one of the longest bridges in the world.