The Private Guides organisation provides English-speaking tour guides and offers city tours that visit selected monuments of Managua, including the cathedrals. It is forbidden to go inside the old cathedral, as it is unsafe.
Managua Cathedral is open to visitors and is a popular tourist attraction, although guided tours of the building are not available. The Cathedral is open to the public for worship and sightseeing.
Managua Cathedral offers a virtual tour of their unusual building on their website (see Reference 3). Most aspects of the cathedral are photographed, including the modernistic roof, nave, cornerstone and altar.