Neo-classic building which during the period when the city was still known as Valladolid housed the College of "San Nicolas", which was founded by Vasco de Quiroga in Patzcuaro in the 16th century. Miguel Hidalgo was dean of this college and Jose Maria Morelos y Pavon one of its most outstanding pupils. The Melchor Ocampo Conference Hall is located on its second floor and can be visited from Monday to Friday from 8:00 a.m. to 3:00 p.m.

Imposing baroque building of pink stone built between 1660 and 1744. Its interior is decorated with Doric features and Neo-classic altarpieces. Among the treasures kept here there is a silver baroque Monstrance and a silver Neo-classic Christening font both from the 18th century, a monumental early 20th century organ with 4600 pipes, and the Lord of the Sacristy, image made in the 16th century using the technique of maize stalk paste.

Baroque construction consisting of 253 arcs, which was built by Bishop Fr. Anthony of St Michael in 1785 to provide the city with drinking water and to give employment to the indigenous.

A fountain located on one side of Villalongin Square, that represents three indigenous women who are holding up a typical tray covered fruits from the region. Throughout the course of time it has become one of the representative monuments of the city.

The construction possesses a 20 meter diameter hemispherical dome in the interior, which works as a screen for 164 projectors that produce swiftly the astral movements, allowing to observe the Milky Way, 17 multitudes of stars and the main sky circles. The Planetarium offers functions Fridays and Saturdays at 7:00 p.m. and Sundays at 6:30 p.m.