Infrastructure · Coober Pedy, South Australia
The town that moved underground
Homes and civic spaces occupy excavated rock to escape surface heat.
Explore place →MapTheOdd / Guides / Remarkable underground places
Curated atlas guide · 7 mapped records
Remarkable underground places
Subterranean homes, hidden civic networks, flood-control chambers and scientific machines built below ordinary maps.
How this guide works. Places come from coordinate-backed records and open datasets. Verify access, weather, tides, borders and opening arrangements before travelling.
Natural world · Chihuahua, Mexico
The cave of giant crystals
Enormous selenite crystals fill a dangerously hot cave chamber.
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Natural world · Waikato, New Zealand
The cave with a living night sky
Glowworms turn cave ceilings into fields of blue light.
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Infrastructure · Saitama, Japan
The cathedral built for floodwater
Huge underground columns support a system designed to divert floods.
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Infrastructure · Montréal, Canada
The city beneath the city
A network of interior passages connects transport, offices and shops.
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Infrastructure · France and Switzerland
The machine crossing an international border
A 27-kilometre particle accelerator loops beneath two countries.
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Infrastructure · Colorado, United States
The command centre inside a mountain
Hardened buildings sit behind blast doors beneath granite.
Explore place →What should I know about remarkable underground places?
MapTheOdd recommends The town that moved underground, The cave of giant crystals, The cave with a living night sky, The cathedral built for floodwater, with maps, evidence sources and related records.
Each place page provides coordinates, evidence, seasonal context and related oddities.