Herzgruft

The Herzgruft (German for 'Heart Crypt') is a burial chamber that protects 54 urns containing the hearts of members of the House of Habsburg.

The crypt is located behind the Loreto Chapel in the Augustinian Church within the Hofburg Palace complex in Vienna, Austria.

[1] The first heart, belonging to King Ferdinand IV, was placed in the Augustinian Church on 10 July 1654, according to his wishes.

[1] King Ferdinand IV instructed that his heart would be interred at the foot of the Holy Mother in the Augustinian Church in Vienna.

The next day, around 9:00 pm, the heart was transferred to the Loreto Chapel and buried at the foot of the Madonna in a simple celebration.