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Portugal - Located near the Alentejo village of Nossa Senhora de Guadalupe, not far from Évora, the Almendres Cromlech comprises the most comprehensive group of structured menhirs in the Iberian Peninsula.

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Norway - Stoplesteinan, a stone circle in the town of Egersund, consists of 16 raised stones and is believed to indicate a burial site.

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Spain - The resort island of Menorca is home to a remarkable megalithic chamber tomb, the Naveta des Tudons. Located on the western part of the island, the tomb draws visitors from across the region.

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Denmark -

Louisenlund, on the Danish island of Bornholm, is the site of one of the country's largest and most important collection of megaliths.

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Sweden - The remarkable Ale's Stones near Kåseberga, Sweden, is a monument shaped as a stone ship.

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Ireland -

A Bronze Age ritual site, the Beltany stone circle was associated with marking the summer and winter solstices and equinox. It is located near the town of Raphoe, County Donegal.

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France -

The tiny island of Gavrinis, located off the Brittany coast, contains the celebrated Gavrinis tomb—a veritable treasure trove of European megalithic art.

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Croatia -

Set on the coast overlooking the Adriatic Sea, the ruins of Monkodonja, a hill fort located near the city of Rovinji, date back to the Bronze Age.

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France -

The mausoleum of Barnenez is one of the earliest megalithic monuments in Europe. This grand Neolithic eye-opener located near Plouezoc'h, Brittany, is also one of the world's oldest man-made structures.

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Ireland - The landmark Poulnabrone dolmen dates back to the Neolithic period. Situated near Ballyvaughan in County Clare, the ancient tomb is a popular tourist attraction.

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Scotland - A UNESCO World Heritage Site, Skara Brae in the Orkney Islands is said to be older than Stonehenge. The Neolithic settlement is in an excellent state of preservation and offers an intriguing glimpse into life around 3,180 BCE.

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France - Sited around the Brittany town of Carnac, this astonishing assortment of dolmens, tumuli and single menhirs, form the largest such congregation in the world.

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Armenia -

The Neolithic stone circles standing within the historical site of Metsamor Castle, near the village of Taronik, have been interpreted as an astronomical "observatory."

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Germany -

Scattered throughout the German state of Mecklenburg-West Pomerania are up to 5,000 megalith tombs, including this dolmen near the town of Rerik.

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Ireland - Standing on the north shore of picturesque Lough Inchiquin in County Kerry, this ancient stone circle comprises five megaliths.

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England -

Supposedly named after a local witch and her brood, Long Meg and her Daughters is an enormous Bronze Age stone circle laid out near the town of Penrith, in Cumbria.

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Ireland - A UNESCO World Heritage Site, Brú na Bóinne, or Boyne valley tombs, is a prehistoric landscape of great significance. It includes the passage grave of Newgrange (pictured). The site is located in County Meath.

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Bulgaria - Perched on the southern Black Sea coast near the city of Primorsko is Beglik Tash, a prehistoric rock sanctuary that features megaliths etched with carvings.

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Ireland - A protected national monument, Carrowmore, in County Sligo, is the largest and certainly one of the oldest cemeteries of megalithic tombs in the country.

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Italy - Nuraghi are ancient megalithic edifices found in Sardinia. Nuraghe Santu Antine (pictured), located in the center of the Cabu Abbas plain, is one of many scattered across the island.

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Italy -

Sardinia is also where you can find the giants' tomb, a type of megalithic gallery grave. Around 800 have been discovered on the island, including Sa Domu e S'Orcu (pictured), in the Siddi region.

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Malta - The megalithic temple complex of Mnajdra is one of the oldest religious sites in the world. Its unique architecture is one of the reasons UNESCO has recognized the structure as a World Heritage Site.

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England - One of the most famous landmarks in the United Kingdom—and recognized around the world—Stonehenge, located in Wiltshire, is believed to have been a burial ground. Endowed with beauty and mystique, the prehistoric monument is a UNESCO World Heritage Site.

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England -

Surrounding the village of Avebury in Wiltshire is the largest megalithic circle in the world. The monument and surrounding prehistoric landscape is a UNESCO World Heritage Site.

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Northern Ireland - Comprising a large circle of over 50 closely spaced upright stones, Ballynoe stone circle, located in County Down, impresses with its dramatic grandeur.

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England -

Set in a quiet corner of the Oxfordshire countryside near the village of Ashbury is Wayland's Smithy, a secluded Neolithic long barrow and chamber tomb.

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Wales -

The mysterious, single diamond-shaped standing stone known as Maen Llia is located in the countryside of Powys. It is thought to date from the Bronze Age, but its original purpose is unclear.

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England -

The Neolithic Merry Maidens stone circle in St. Buryan, Cornwall, is named after a legend suggesting that 19 maidens were turned into stone as punishment for dancing on a Sunday.

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Germany -

Located near Keitum on the island of Sylt, the megalithic tomb known as Harhoog is a weather-worn dolmen dating back to the Neolithic.

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Belgium -

The Wéris megaliths, named for the nearby village of Wéris, include dolmens and menhirs, and form a group of monuments unique in Belgium.

See also: Unearthed! Priceless buried treasures revealed

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