Called the Grand Entrance Hall, the underground space – opening today – will be run by The Brunel Museum and is set to host plays, operas, concerts and even weddings.

Architects Tate Harmer breathed new life into the 1843 Grade II*-listed shaft – originally designed by civil engineer Isambard Kingdom Brunel and his father Marc – adding a cantilevered staircase to make the 75ft-deep hall accessible. — thespaces.com

Deep in the Transylvanian countryside lies an ancient salt mine dating back over two millennia.

Today Salina Turda has become an unlikely tourist attraction, with thousands of visitors descending its vertical shafts each year to play mini-golf, go bowling and row around its underground lake. [...]

British photographer Richard John Seymour recently travelled to Salina Turda in his quest to document human-altered landscapes. — thespaces.com

The irony of [Metelkova Mesto's] transformation – from the military arm of a censorious regime to a tolerant artistic community – is what makes the regeneration project of this space so encouraging...Metelkova, in contrast, has built its image firmly on its artistic and cultural credentials. It’s autonomous, but not anarchistic; liberal, but not lawless. — The Guardian

There has long been a subculture of so-called “urban explorers” who have made a game of accessing off-limits places. [...] Urban explorers take photos mainly to document that they’ve been there, while for Deas the image is the whole point. The outlaw Instagrammers have more in common with graffiti artists, another subculture of underground creatives who make their work in the cracks of the urban landscape. — nymag.com

As modern Philadelphia shapes its future, some of its citizens have turned to the artifacts of its former prowess for inspiration. Much as the High Line in New York is widely believed to have been partially responsible for the reinvigoration of not only a derelict site but also its surrounding neighborhood, a portion of elevated rail track in central Philly known as the Reading Viaduct has been hoisted into public view as a potential catalyst for urban transformation.

Because of Beijing’s sky-high apartment rental costs, as many as two million people—about a tenth of the city’s population—are said to be living below street level in underground storage basements and air-raid shelters partitioned into cramped, windowless rooms. Many of those who have to crowd into these homes are migrant workers like Wang, from the nearby province of Hebei. — qz.com

The above ground structure is just like any other– with the only hints being multiple air conditioning units, and emergency exits around the property. The underground interior is one that’s stuck in the hippy chic 1970′s days. Pink draperies, carpet and classic columns outfit the dated interior. Putting greens, a rock facade barbecue and natural style light settings make for an interesting setting that’s completely user controlled. — inthralld.com

The biggest public transit infrastructure effort in the US is almost completely invisible — unless you’re 160 feet underground. The East Side Access project will connect the Long Island Railroad to New York’s Grand Central Terminal via a massive tunnel under the East River. Actually, that tunnel was the easy part; it was started in 1969. The hard part? “We are building a brand-new railroad here,” says Michael Horodniceanu, president of Metropolitan Transit Authority Capital Construction. — wired.com

As dark matter particles steam through the detector, scientists hope that a few will collide with the argon atoms. This will generate two flashes of light - one in the liquid argon and another in the gas - which will be detected by the receptors. — BBC News

Our aim is to examine the city's connection to its underground in a way no one has before: we will attempt to walk from the southern edge to the northern, using only catacombs, telecom tunnels, sewers and other hidden infrastructure. It is a 14-mile trek, every step illegal. — The Economist's Intelligent Life magazine

Deep in the belly of New York’s subway system, a beautiful untouched station resides that has been forgotten for years with only a limited few knowing of its existence. Stunning decoration with tall tiled arches, brass fixtures and skylights run across the entire curve of the station, almost a miniature imitation of Grand Central Station… — travelettes.net

Through meticulous infiltration, UX members have carried out shocking acts of cultural preservation and repair, with an ethos of “restoring those invisible parts of our patrimony that the government has abandoned or doesn’t have the means to maintain.” The group claims to have conducted 15 such covert restorations, often in centuries-old spaces, all over Paris. — wired.com

This lovely underground home is slated to be the first zero-carbon home in the North West of England. Designed by Make Architects, this 4-bedroom oasis leaves the views of nature in tact above the ground while creating spaces filled with light and space below the ground plane. — michellekaufmann.com