3 ms·
I wonder how long, unmaintained, it would take to collapse. Would some future civilization find a tunnel?
by mmooss 10mo ago
I wonder how long, unmaintained, it would take to collapse. Would some future civilization find a tunnel?
- MangoToupe 10mo agohttps://en.wikipedia.org/wiki/Tunnel_of_Eupalinos https://en.wikipedia.org/wiki/Tunnel_of_Eupalinos That one is ~2600 years old