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Dug into the Bethany Falls limestone mine, SubTropolis is up to 160 feet (49 m) beneath the surface. It has a grid of 16-foot-high (4.9 m), 40-foot-wide (12 m) tunnels separated by 25-foot-square (7.6 m) limestone pillars created by the room and pillar method of hard rock mining. [1]
The commissary sold food to both co-op members and surrounding residents, and served as the hub of social activity for the community. The co-op operated until the end of World War II, when it was sold to private owners. The commissary continued to operate as a general store for the community until the early 2000s. It was converted into a ...
Limestone (calcium carbonate CaCO 3) is a type of carbonate sedimentary rock which is the main source of the material lime. It is composed mostly of the minerals calcite and aragonite, which are different crystal forms of CaCO 3. Limestone forms when these minerals precipitate out of water containing dissolved calcium. This can take place ...
Coal, iron ore, ganister, and limestone are found in the vicinity. In the past, the borough had foundries and machine shops, a silk mill, car works and classification yards . From 1834 to 1854, the borough was an important port on Pennsylvania Main Line Canal , where the Juniata Division Canal connected to the Allegheny Portage Railroad .
The Hub, setting for several short stories and novels by science fiction writer James H. Schmitz The Hub, an “enigmatic” level of The Backrooms which is a car tunnel which has doors that lead to multiple levels, just like Warp Zones from the Super Mario series.
During the late 19th and early 20th centuries, Walkerville was a thriving industrial hub due to its lime production. Limestone mined from local cliffs was processed in six kilns and transported by horse-drawn trams to a 300-meter jetty for shipping. [5]
As the site slopes to the west, the basement is exposed on other sides. Constructed of native limestone laid as fieldstone, with quoins at each corner, the building's load-bearing masonry walls are three feet thick in places. All masonry openings have segmental arches with voussoirs (wedge-shaped stones) of matching limestone. [3]
The brick courthouse sits on a limestone base and has a Late Victorian design which includes elements of the Romanesque Revival, Queen Anne, and Free Classical styles. The building is topped by four corner towers and a central cupola. Three of the courthouse's four entrances feature arched doorways surrounded by porches, while the north ...