16. The Largest Vent Chimney Is Known As “Poseidon”
Poseidon is nearly 200 feet tall, making it the most prominent and easily recognizable feature of Lost City. Poseidon is actually crowned by four smaller chimneys that have formed by the tens of thousands of years of heated, mineral-rich water being emitted by its source vent.
Surrounding Poseidon is buttresses of smaller chimneys and other deposits that have built up around it. It basically looks like a giant cave formation – like stalactites and stalagmites that were formed by centuries or even millennia of dripping water.