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Housed in the historic 16th-century Casa de las Ajaracas, it is a rare survivor on a street that has seen other historic structures knocked down to explore the Templo Mayor site. The museum is home to a huge collection of historical photographs from the 19th, 20th and 21st centuries, documenting the constantly changing cityscape of Mexico City.
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Caricature Museum
Depicting the history of Mexican cartoons (political and amusing cartoons).
CCEMx / Cultural Center of Spain in Mexico
This is the official cultural center from the Spanish Embassy and features temporary exhibits.
La Enseñanza Church
Tucked away on a side street, this very narrow gem of a church was built in the 1770s and is notable for being an outstanding example of Mexican Churrigueresque architecture. Even more remarkable than the façade, however, are the nine gilt retablos inside.
Features an open-air diorama of the old Tenochtitlán.
The site of the main Aztec temple of Tenochtitlan, it was destroyed by Spanish conquistadors in 1521, who then promptly erected the Cathedral roughly over it – but not quite. Centuries later, nearly completely forgotten, its actual location was discovered by accident in 1978 when electrical workers found a piece of a large stone disc depicting the goddess Coyolxauhqui. This set off a few furious years of archaeological digging, resulting in a rather surprising (and extremely significant) discovery that nested underneath the original Aztec temple was six distinct smaller, older temples. You can see each layer walking through the dig site.
Metropolitan Cathedral
The largest cathedral in the American continent. Designed by Claudio de Arcinieaga, construction started in 1537 and lasted for 250 years. Be sure to check out the side chapels where parishioners leave offerings for the various saints. For a bird's-eye view of the plaza, you can take a 40-minute tour (Spanish language only) of the upper levels and bell towers of the cathedral (M$12).