The most spectacular aspect is the size of the Pantheon. On the ground floor, in the form of a cross, it has a length of 110 m (352 ft) and a breadth of 85 m (272 ft.).

While Louis XV was taking care of his health, he promised that if he recovered, he would build a church to replace the half-ruined Abbey of St. Genevieve.

However, due to the lack of funds, the project did not begin until 1755. And the architect Soufflot designed a building based on the Classical prototypes.

This being a dome with a Latin cross which is fronted by a Greek temple facade. During the construction, Soufflet passed away and the church which is known today as the Pantheon, was finally completed in 1789 - the year of the French Revolution.

This is a spectacular product of classical design surmounted by a huge dome.