Ace Ventura: Pet Detective was filmed in the United States of America.
Ronald Camp's Villa
In movie
Scene where Ace Ventura and Melissa Robinson went to a party at the home of Ronald Camp.
Real
Scene was shot Villa Vizcaya is the main house of the Vizcaya Museum and Gardens.
The Vizcaya Museum and Gardens, previously known as Villa Vizcaya, is the former villa and estate of businessman James Deering, of the Deering McCormick-International Harvester fortune, on Biscayne Bay in the present day Coconut Grove neighborhood of Miami, Florida. The early 20th century Vizcaya estate also includes: extensive Italian Renaissance gardens; native woodland landscape; and a historic village outbuildings compound. The landscape and architecture were influenced by Veneto and Tuscan Italian Renaissance models and designed in the Mediterranean Revival architecture style, with Baroque elements. Paul Chalfin was the design director.
Miami-Dade County now owns the Vizcaya property, as the Vizcaya Museum and Gardens, which is open to the public. The location is served by the Vizcaya Station of the Miami Metrorail. (source: Wikipedia)
You can also see the villa as the home of Aldrich Killian in Iron Man 3.
Miami