Built upon the remains of a mosque, this church is dedicated to the city's patron saints, whose martyrdom coincides with the traditional date of the city's reconquest, believed to have occurred on July 17, 1243. The structure is a single-nave Gothic temple, featuring side chapels between buttresses that date back to the 14th and 15th centuries. The presbytery and the side doorway, known as the Anunciación, are designed in Renaissance style. Alongside the nave, the Baroque Communion Chapel can be found. The main facade is adorned with a grand doorway, also in Baroque style, which was crafted by Antonio Villanueva and Cristóbal Sánchez. Particular attention should be given to the Gothic-style bell tower, which is remarkably slender and likely completed in the mid-15th century. The tower features gargoyle-shaped drains in its corners and sculptures of mythical beasts. Additionally, the clock, commissioned by the town council in 1439, is of historical interest.

Experience firsthand why Portland is known as the "City of Roses" by visiting its Rose Test Garden, the oldest official rose garden in the U.S. Established during World War I, the garden was originally created as a refuge for roses threatened by bombings and potential extinction. Not only did the roses survive, but they have continued to thrive and bloom in Portland. The garden is open to visitors from April through October, with the peak bloom occurring in June.

These lavish gardens were constructed in 1694 as a residential retreat for Mitsutomo, the second Lord of the Owari clan. Sadly, however, most of the garden and its buildings were destroyed during World War II. The restoration took a long time, with the garden being finally opened as a public park in 2004. If time permits, visit the adjacent Tokugawa Art Museum, the third oldest private museum in Japan, which miraculously survived the World War II air raids.