Over 70 percent of Earth’s surface is covered by water. And across the millennia, the works and structures of mankind are claimed or reclaimed by its lakes, seas, and oceans. From surviving ancient manuscripts and legends, it survives the memory that lands have been swallowed by the seas, destroying civilizations in the process. The most famous of all the lost lands is the legend of Atlantis. The Lost City of Atlantis, first mentioned by the ancient Greek philosopher Plato more than 2,300 years ago, is known as one of the oldest and greatest mysteries of the world. According to Plato, the utopian island kingdom existed some 9,000 years before his time and mysteriously disappeared one day. The coincidental date from the Younger Dryas Boundary time-frame of around 12.500 years ago. But there is more that just man-made underwater settlement caused by natural sources. Let’s dive in!
Yonaguni Monument. Off the coast of the most southern cost of the Ryuku Islands in Japan is located one of the world’s most mysterious underwater structures – the Yonaguni Monument. It was discovered by a local diver in the 1980s. Then a team of scientists led by Masaaki Kimura visited the underwater structure and concluded that it had to be man-made with stunning massive rectangular formations, perfect 90-degree angles, straight walls, steps, columns and what appears as a human face carved in the rock. The only logical explanation is that the structure was built when the site was above sea level which was around 10,000 years BC or according to the latest findings, about 3,000 to 2,000 years ago when it was sunk by an earthquake.
Bimini Road. The Bimini Road is a 0.5 mile (0.8 kilometer) long submerged structure is located off the coast of the island of North Bimini in the Bahamas. The submerged structure consists of huge rectangular and semi-rectangular blocks that are arranged in perfect geometric patterns. Although many scholars believe that it is a natural formation, others believe the scale and precision cannot be work of nature. If the Bimini Road, however, is man-made, it must have been built when the area was above the sea level which was thousands of years ago. The mysterious underwater structure is thought to be ruins of a harbor or a temple even though it is also suggested to be an extension of the legendary Atlantis.
Cuban Underwater City. This underwater structure raises more questions than answers. The structure Cuban underwater city is located off the coast of western Cuba as much as 2,000 feet (650 meters) below the sea level. It appears to be ruins of a submerged city with corridors and buildings including massive granite complexes, pyramids and circular structures. According to the scientists, it would take about 50,000 years for the alleged city to be submerged to its current depth.
Underwater ruins at the bottom of Lake Titicaca. Ancient megalithic structures appear to be quite widespread at the bottom of Lake Titicaca in Bolivia. In 1980, the famous Bolivian researcher of pre-Columbian cultures, Hugo Boero Rojo, announced the discovery of ruins at a depth of 15 to 20 m off the coast of Puerto Acosta, near the Peruvian border on the northeastern shore of Lake Titicaca. At a press conference, he stated: “We found a temple built of huge stone blocks, no one knows where leading stone roads and stairs, the bases of which are hidden in lush thickets of seaweed”. Boero Rojo attributed these monumental ruins to the time of the rise of Tiahuanaco.
In early 2001, the Italian scientist Lorenzo Epis confirmed the presence at the bottom of the lake. Titicaca remains of the ancient city. In August 2000, an international archaeological expedition (according to other sources, a group of Italian divers and archaeologists) discovered in Lake Titicaca at a depth of 30 m the ruins of an ancient temple measuring 200 m x 49 m, a pavement, a wall 790 m long, terraces for growing crops and a sculpture carved from stone in the form of a human head, reminiscent of the stone sculptures of the city of Tiahuanaco. According to local legends, the city of Wanaku is located at the bottom of the lake.
Structure in Lake Macdonald. Divers discovered proof of Ontario’s ancient past while taking part in a unique submarine project at a depth of 40 feet (12 m) below the surface. The structure is composed by a massive 1,000 lb. (453 kg) elongated megalithic rock with an almost completely level surface resting on 7 baseball-sized stones, which in turn sits on a huge several thousand-pound slab on top of a ledge. It was thought to be a natural formation until geologists and archaeologists looked at the images. The discovery of the man-made “rock cairn”, was deemed to be proven when an underwater archaeologist concluded the existence of three shims was enough proof that the structure was man-made.
Baltic Sea Anomaly. The discovery of the disc-shaped Baltic Sea anomaly keeps the community searching for answers. 
The structure appears as a UFO, anti-submarine defense tool, or a megalithic rock dragged across the sea floor. Although Swedish explorers generally convinced everyone that it is a rock and not a UFO, their research has raised a lot of questions. Firstly, the rock didn’t have a silt-layer on it, which is usually the case when rocks have been lying still at the bottom of the ocean for any period of time. Furthermore, the 196 feet (60 m) wide rock seems to be covered by construction lines and boxes and it appears to be propped up by a 26 foot (8 m) high pillar.
Lake Michigan Stonehenge. The famous Stonehenge located in the UK is one of the most famous historical stone monuments in the world, but not exclusive. Similar stone arrangements have been found worldwide. In 2007 while surveying the bottom of Lake Michigan with sonar, a team of underwater archaeologists discovered a series of stones aligned in a circle 40 feet (12 m) below the surface. 
One of the stones also seemed to feature a carving of a mastodon, an animal that has been extinct for longer than 10,000 years. If the site is validated, it would not be completely out of place, as other stone circles and petroglyph sites can be found in the vicinity.
Gulf of Khambhat. In May 2001, it was announced the ruins of an ancient city was discovered in the Gulf of Khambhat. The discovery was made with the help of sonar while routine pollution studies were being done. During the announcement, the site was described as evenly spaced dwellings, a drainage system, bath, granary and a citadel that pre-dates the Indus Valley Civilization. During follow-up investigations, the area was dredged and several artifacts were recovered. Among them were wood (dated ± 7,000 BC), stones described as hand tools, fossilized bones, pottery sherds and a tooth.
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