The history of the world is full of surprising mysteries. None of us will live long enough to see them all solved. But it's always interesting to have a look at some of the truly bizarre things which lie beneath the surface.

1.Stone-Age Tunnels

These tunnels were carved by hand during the Stone Age underneath almost all of Europe, spreading from Scotland even into Turkey. Although the real purpose of the tunnels is still a mystery, some researchers believe they were used as a means to travel safely around predators, weather, and various conflicts

2. Moa Birds

Moa were nine species (in six genera) of now-extinct flightless birds endemic to New Zealand. The two largest species, Dinornis robustus and Dinornis novaezelandiae, reached about 3.6 m (12 ft) in height with neck outstretched, and weighed about 230 kg (510 lb)[5] while the smallest, the bush moa, was around the size of a turkey. Estimates of the Moa population when Polynesians settled New Zealand circa 1300 vary between 58,000 and approximately 2.5 millions

3.Gate of the Sun, Bolivia

The Gate of the Sun, also known as the Gateway of the Sun, is a monolith carved in the form of an arch or gateway at the site of Tiahuanaco by the Tiwanaku culture, an Andean civilization of Bolivia that thrived around Lake Titicaca in the Andes of western South America around 500-950 CE

Tiwanaku is located near Lake Titicaca at about 12,549.2 ft (3,825.0 m) above sea level near La Paz, Bolivia. The Gate of the Sun is approximately 9.8 ft (3.0 m) tall and 13 ft (4.0 m) wide, and was carved from a single piece of stone. Its weight is estimated to be 10 tons. When rediscovered by European explorers in the mid-19th century, the megalith was lying horizontally and had a large crack through it. It presently stands in the location where it was found, although it is believed that this is not its original site, which remains uncertain.

4.The giant stone spheres of Costa Rica

The stone spheres of Costa Rica are an assortment of over 300 petrospheres in Costa Rica, on the Diquís Delta and on Isla del Caño. Locally, they are also known as bolas de piedra (literally stone balls). The spheres are commonly attributed to the extinct Diquís culture, and they are sometimes referred to as the Diquís Spheres. They are the best-known stone sculptures of the Isthmo-Colombian area.

They are thought to have been placed in lines along the approach to the houses of chiefs, but their exact significance remains uncertain

5.The Unfinished Obelisk, Egypt

The unfinished obelisk is the largest known ancient obelisk and is located in the northern region of the stone quarries of ancient Egypt in Aswan, Egypt.

Its creation was ordered by Hatshepsut (1508–1458 BC), possibly to complement what would later be known as the Lateran Obelisk (which was originally at Karnak, and was later brought to the Lateran Palace in Rome). The unfinished obelisk is nearly one-third larger than any ancient Egyptian obelisk ever erected. If finished it would have measured around 42 metres (138 ft) and would have weighed nearly 1,090 tonnes (1,200 short tons), a weight equal to about 200 African elephants.

From:https://www.google.com/amp/s/brightside.me/wonder-curiosities/ten-discoveries-that-no-one-can-explain-2005/amp/

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