The facade of this 16th century church might not impress you, but do not let the unassuming exterior discourage you from entering! The interior hides incredibly ornate wood carvings. The church is not so easy to find, but it is totally worth seeing.
Wikipedia https://en.wikipedia.org/wiki/Igreja_de_Santa_Clara_(Porto)
Address Travessa de Santa Clara, 4000 Porto, Portugal
Coordinates 41°8'32.944" N -8°36'33.104" E
