rialto (re-AL-to) noun
1. A theatre district.
2. An exchange or marketplace.
[After Rialto, an island of Venice which was the commercial center of the city. The Rialto bridge was the first bridge on the Grand Canal.]
Click here for a picture of the Rialto Bridge.
"It was this... that made it some forty or fifty years ago the rialto of the West Indian islands." Daily Chronicle; Sep 23, 1901.