was started in 1573. It remained a work in progress during the entire
colonial period, hus displaying an array of architectural styles. It
was originally modelled after Seville's seven-nave cathedral, but
after running into problems with the spongy subsoil, it was scaled
down to five naves.
Mexico City is sinking into ground and the cathedral appears to be
tilting to a side. The historic center has dropped some 10m (30ft) in
the last 100 years. The entire city has been sinking since the
colonial times, when the Spaniards got the bright idea o draining the
lake that filled the highland basin.

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