So this is a thread where every once in a while, a Church father (or mother) we venerate would be known where his (or her) body is. This way, someone travels somewhere, one can refer to this thread for reference to take a blessing. I am not looking for accuracy or authenticity of the body, just what custom says, and we'll leave the decision to venerate to your discretion of faith.
Let's start with the 12 Apostles.
St. Peter--St. Peter's Basilica, Vatican, Rome, Italy
St. Simon the Zealot--(same, also the Basilica of St. Sernin, Toulouse, France)
St. Jude (same, also the Basilica of St. Sernin, Toulouse, France)
St. Bartholemew--St. Bartholemew's Basilica, Tiber Island, Rome, Italy, also in Frankfurt Cathedral, Frankfurt am Main, Germany and Canterbury Cathedral, Canterbury, Kent, England
St. Matthew--Salerno Cathedral, Salerno, Italy
St. James son of Alphaeus--Santi Apostoli, Rome, Italy
St. Philip (same) (original first century tomb in Heirapolis, Turkey has been found recently; of course, it's empty)
St. James, son of Zebedee--Santiago de Compostela, Galicia, Spain, also the Basilica of St. Sernin, Toulouse, France
St. Andrew--the Basilica of St Andrew in Patras, Greece; the Duomo di Sant'Andrea, Amalfi, Italy; St Mary's Roman Catholic Cathedral, Edinburgh, Scotland; and the Church of St Andrew and St Albert, Warsaw, Poland
St. Thomas--Cathedral of St. Thomas the Apostle, Ortona, Italy; Monastery of St. John the Theologian, Patmos, Greece; and San Thome Basilica, Chennai, Mylapore, India
St. Matthias--Abbey of St. Matthias, Trier, Rhineland-Palatinate, Germany, and maybe the Gonio (Asparos) Fortress, Adjara, Georgia
St. John--nowhere to be found; some claim the Basilica of St. John, Ephesus, Turkey is where he was buried but others claim his body was assumed like the Theotokos
In Italy alone, there exists relics of 9 Apostles, 3 in France (same Cathedral), 2 in Germany, 2 in Greece, and one each in England, Spain, Scotland, Poland, and India
Also St. Paul--Basilica of St. Paul Outside the Walls, Rome, Italy