Hertfordshire is a county in southern England that sits directly above London. With occupation stretching as far back as the Mesolithic period, Hertfordshire is rich in a variety of historical sites, monuments and ancient ruins waiting for you to explore.
A cave is a hollow place in the ground, specifically a natural underground space large enough for a human to enter. Caves form naturally by geothermal activities or the weathering of rock and often extend deep underground.
A pyramid is a structure whose outer surfaces are triangular and converge to a single point at the top, making the shape roughly a pyramid in the geometric sense. The base of a pyramid can be trilateral, quadrilateral, or of any polygon shape.
A trelleborg or ring fort was a circular fortification built across Denmark and Sweden during the Viking age. Similar structures have been found throughout Northern Europe, particularly in Ireland, but none have the same strict and precise geometrical design of the Scandinavian ring fortresses.
A space station is a spacecraft capable of supporting crewmembers, which is designed to remain in space (most commonly as an artificial satellite in low Earth orbit) for an extended period of time and for other spacecraft to dock.
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