It may look more like the Pantheon or a Greek temple, but this is indeed the main cathedral of the Catholic Church in Argentina.

There has been a church on this location since 1593 under orders from the city’s founder Juan de Garay.

After 7 re-builds, the current structure we see today dates back to 1752.

Outside the entrance burns the eternal flame for the unknown soldier and General San Martin.

The Mausoleum of General San Martín is a must-see, this is the final resting place of the famous liberator.

It is in the third chapel to the right of the central nave.

The three women standing guard at the base represent Argentina, Chile, and Peru: the three countries liberated by San Martín.

There are two soldiers, grenadiers (granaderos), standing guard outside the entrance to the chapel. The Granaderos are the infantry that was founded by San Martin himself.

Changing of the guard: See the changing of the guard every day on the odds (from 7 am until 5 pm), example - 7 am, 9 am, 11 am, etc. until 5 pm.

New guards will march from the Casa Rosada to replace those in front of San Martin's tomb, then with the relieved guards they will return to the Casa Rosada. You can see them in the Cathedral or throughout the plaza at this time.