Which two churches in Bratislava have a crown on their towers?

The answer:

St. Martin's Cathedral, St. Elizabeth's Church (Blue Church)

The royal crown is on the tower of St. Martin's Cathedral (St. Martin's House) and St. Elizabeth's Church (Blue Church).
The crown on St. Martin's Cathedral symbolizes Bratislava's status as the coronation city of the Kingdom of Hungary, which it was from 1563 to 1830. The tower therefore houses a faithful, gilded copy of the St. Stephen's Crown (the Hungarian royal crown) resting on a cushion.
The tower of the Church of St. Elizabeth is topped with a roof, the top of which is stylized in the shape of the Hungarian royal crown and is an Art Nouveau artistic expression of the architect Ödön Lechner.
Its metal top with a cross imitates the St. Stephen's Crown (the Hungarian royal crown), which refers to the royal origin of Saint Elizabeth of Hungary (Thuringia), to whom the church is dedicated. At the same time, the depiction of a rose as a symbol of Saint Elizabeth, who was the daughter of King Andrew II of Hungary and was born at Bratislava Castle, also refers to it.