The image shown is an example of a prehistoric tumulus. It is one of the mounds located in a pre-Columbian native American city called Cahokia in now Illinois, USA (about 1050-1350 AD). The Cahokia mounds are considered as UNESCO World Heritage Sites. It is called the?

It is a large prehistoric passage tomb built 3,200 BC located in County Meath, Ireland. It is part of what is known as Boyne valley tombs that consists

large Neolithic passage graves. The structure shows an early example of corbeled vaulting. The site was designated as UNESCO World Heritage Site in 1993.

It is a Neolithic henge and stone circle (cromlech) located in Orkney, Scotland. It is part of a series of Neolithic monuments in Orkney which was designated as UNESCO World Heritage Site in 1999.

It is the remains of a megalithic temple complex built 3,600 to 3,200 BC in the island of Malta. The megalithic temples of Malta were designated as UNESCO World Heritage in 1980.

It is the remains of a Neolithic megalithic temple in the island of Gozo in Malta. built between 3,600 to 2,500 BC. The stone temple is part of the Megalithic Temples of Malta which are UNESCO World Heritage Sites.

It is a famous Roman structure in Lugo, Spain. The walls were constructed in 3rd century AD and are still largely intact. The fortifications were listed as UNESCO World Heritage Site in 2000.

It is an unfinished Roman theater in the ancient Palmyra in Syria. The 2nd century CE theatre was built in the center of a semicircular colonnaded piazza which opens up to the South Gate of Palmyra. The site is a UNESCO World Heritage since

1980.

It is a Roman circus built in 2nd century AD in Tyre, Lebanon. It is one of the best-preserved Roman circus which made it a UNESCO World Heritage Site. The image shows some of the ruins of the cavea of the?

It is an aqueduct bridge built in 1st century AD in Nimes, France. It is the highest of all Roman aqueduct bridges and among the best-preserved. It is even added as UNESCO World Heritage Sites.

It is a Roman aqueduct bridge, part of the aqueduct supplying water to the ancient Roman city of Tarraco in Catalonia, Spain. The structure is a famous landmark in Spain and was listed as a UNESCO World Heritage in

2000.

it is a ruined Roman aqueduct bridge that was used to supply water to the ancient Roman colony of Emerita Augusta, now Merida, Spain. Due to its impressive ruins, the structure was listed as UNESCO World Heritage Site.

It is a large Roman city gate in Trier, Germany. It is today the largest Roman city gate north of the Alps. It was built in grey sandstone in 170 AD and turned dark during the Middle Ages which gained its name. It is also designated as UNESCO World Heritage Site.

It is a Roman lighthouse in Galicia, Spain. It is the oldest surviving lighthouse and the only fully preserved Roman lighthouse still used today. Built around 1st century AD and modeled after the Lighthouse of Alexandria, the structure was listed as a UNESCO World Heritage Site.

It is an ancient Roman palace built between 295 and 305 CE at Split, Croatia by the emperor Diocletian as his place of retirement. It is the largest and best-preserved example of Roman palatial architecture, representing a transitional style half Greek and half Byzantine. It was designated as a UNESCO World Heritage in 1979.