A quick survey of the Mediterranean reveals a number of countries with thriving cities in this region. The most popular Mediterranean city for tourists is undoubtedly Barcelona, whose largest source of income is tourism. One of the most visited places of interest in Barcelona is the Sagrada Familia, which is a famous Roman Catholic church designed by the renowned architect Antoni Gaudí. Another popular attraction is the Park Güell, which was designed by Gaudí as well. Another Mediterranean city that is extremely popular with tourists is Venice, Italy.