Templo de Santa Teresa la Nueva survives on what it holds, not on how it's kept. Built in the early 1700s by Pedro de Arrieta, this active parish church in the Centro Histórico guards a wax reliquary of Santa Celeste - a ninth-century skeleton sealed in display - and a devotional Virgin of Loreto with an ongoing cult following and reported miracles. The bottled holy water shop, organized by saint, is a ritual you won't find replicated elsewhere in Mexico City. But the building itself is deteriorating visibly: frescoes fading, vitrines filmed with dust, ceiling paint lifting, light insufficient to read anything clearly. The church's administration hasn't matched the pace of decay. Come for what's inside. Don't come expecting care.
The ninth-century saint in a wax sarcophagus, bones visible through wear on her hand, stops you cold whether you believe or not. The 18th-century building earns its place on the street, but the peeling paint and earthquake-damaged frescoes are a real problem for what is inside
When to go
Saturday and Sunday mornings preferred; weekday hours cut short (10:00–15:00).
How long
Allow 1 to 2 hours to read the frescoes and reliquaries without rushing.
Do not miss
The Santa Celeste reliquary (wax case, ninth-century bones) and the saint-specific holy water shop.
Entry
Free entry. Active worship site - respect service times and sanctuary conduct.