One of the largest complexes of colonial ruins in Antigua, the Convento de Santa Clara was built in 1715 as the home of an order of Franciscan nuns founded some years earlier by a group of six sisters from Mexico. Today this ruin is most notable for its facade, which largely survived the earthquake of 1773 that devastated the complex; it's one of the most ornate in all of Antigua, replete with intricate statuary and ornamentation in molded stucco. Interestingly, the facade is located in the rear of the complex: in front is a spacious, well-tended courtyard garden not too different from the one at Colegio de San Jerónimo, ringed by the ruined remains of the former cloisters. Ascend to the upper level for a nice view over the surrounding mountains.
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This grand old church is one of the most visited of Antigua's ruins, thanks to its status as final resting place of Hermano Pedro de San José Betancurt: a 17th-century monk who is the first Catholic saint to hail from Guatemala, and was renowned as the "St. Francis of Assisi of the Americas" due to his ascetic lifestyle, charitable generosity, and aid to marginalized groups within colonial Guatemalan society. A multi-domed structure in the Spanish Baroque style, San Francisco el Grande is a classic example of colonial-era architecture. It was partially reconstructed after the earthquake of 1773 and is still an operating church, but there's also a small museum onsite dedicated to Hermano Pedro and the history of the church.
Catedral de San José
The second church to occupy this site and one of the largest in Central America during its heyday, the Catedral de Antigua Guatemala was built in 1680 to replace its antecessor that dated to 1541. While most of the building was leveled during the earthquake of 1773, the ornate Baroque facade emerged relatively unscathed. While a partial reconstruction beginning in the 19th century has allowed the building to once again be home to a functioning church, other portions of the complex remain in ruins.
Real Palacio de los Capitanes Generales
A museum showcasing preHispanic and colonial artifacts in part of this historic government palace.
Plaza Mayor
This park is a city block in size, with concentric circular walkways threading among trees and a fountain in the middle. The trees are decorated with lights, and there are plenty of benches for sitting and people-watching. The city hall and police office, the cathedral and several banks and tourist businesses line the four sides of the park. Many Antiguans hang out in the park, and it has a pleasant, bustling, friendly feel during the day (at night, slightly less so. Use your judgment).
Small but high-quality museum interpreting history of Guatemalan currency.