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  2. Dragon's teeth (fortification) - Wikipedia

    en.wikipedia.org/wiki/Dragon's_teeth_(fortification)

    Russian anti-tank obstacles near the horizon, Kherson Oblast, May 2022. Dragon's teeth on the left, Czech hedgehogs on the right In Belgorod Oblast, defensive lines of dragon's teeth were constructed in October 2022 under the supervision of the Wagner Group along the Russia–Ukraine border, intended as a second line of defense alongside trenches and a trained militia in the event the ...

  3. Bolwoningen - Wikipedia

    en.wikipedia.org/wiki/Bolwoningen

    Each Bolwoning (literally 'sphere house', or 'ball house') is constructed with Glass fiber reinforced concrete. The houses were prefabricated in Rotterdam and could be erected in as little as one day and were designed to have low energy consumption and easy maintenance. [1] [2] Each house has three main levels, with storage in bottom.

  4. Bollard - Wikipedia

    en.wikipedia.org/wiki/Bollard

    An illuminated bollard has a recessed base light unit in the foundation to illuminate the traffic bollard from all angles. [15] The main components are housed below the road or pedestrian surface (typically a concrete surface) so that if a vehicle strikes the traffic bollard the parts below the surface are not damaged.

  5. Concretion - Wikipedia

    en.wikipedia.org/wiki/Concretion

    Dorodango – Japanese art form in which earth and water are molded to create a delicate shiny sphere; Gypcrust – Hardened layer of soil with a high percentage of gypsum. CaSO 4 concretions in arid and semi-arid soils; Klerksdorp sphere – Natural nodule-like rock concretions; Martian spherules – Small iron oxide spherules found on Mars

  6. Unisphere - Wikipedia

    en.wikipedia.org/wiki/Unisphere

    The Unisphere is centered in a 310-foot-diameter (94 m) circular reflecting pool, with a floor of poured concrete surrounded by a bulkhead of granite and concrete. Forty-eight pairs of fountainheads, on the outer edge of the pool, are designed to obscure its tripod pedestal. [31] Prior to the 1990s renovation, there were 48 single fountainheads ...

  7. List of largest domes - Wikipedia

    en.wikipedia.org/wiki/List_of_largest_domes

    Concrete: 1st century BC – 1st century BC 6.52 21.4 Stabiae Thermae Laconicum: Pompeii, Italy Roman Empire: Cone vault (early form of a dome). Oldest known dome built with Roman concrete. [3] 1st century BC – 19 BC Temple of Mercury (details earlier) since 128 Pantheon (details earlier) Masonry: 2nd century – 150 11.5 38 Red Basilica ...

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