There are eight Element temples strewn across the Earth, one for each Element and then a master temple in Bermuda.
The Fire temple is in San Diego. More fire elementals live here.
The Water temple is in St. Petersburg. It snows a lot there but it rarely sticks.
The Electric temple is under the Christ The Redeemer statue, in the mountain, and uses the statue as a conduit.
The Atomic temple is atop the Large Hadron Collider in Switzerland. They have obviously made great improvements to it.
The Earth temple is in New Delhi, mostly underground. It can stop earthquakes in a 1500 mile radius.
The Air temple hovers over Tokyo. It makes the area around it incredibly windy.
The Necro temple is atop the Reichstag in Berlin. People speculate it was placed there as a result of the Nazi empire.
At any of these temples there will be a high concentration of that kind of element.