Together with the Birmingham and Brompton Oratories, the Chapel at Ware is one of the candidates I would put forth if I were asked to nominate three Catholic churches to survive a holocaust. It was built before the English Church had cathedrals, and so it in many ways has the feel of a Cathedral, particularly of the London District. This is partly because of the numbers of Vicars Apostolic buried there, or remembered by chantries; and, aesthetically, it is the product of A W Pugin's successful realisation of the spirit of late Gothic Christianity.
I think he would have been pleased to see it in heavy use around dawn when traddy clerics are in residence: the murmur, the tinkling of bells, as priests and their servers take turns saying their private Masses at the (is it six?) altars. There are also many relics, and a beautiful Shrine Chapel of S Edmund of Abendon*, containing a femur of the Saint brought from his shrine at Pontigny. He also features prominently in the glass.
The College also has fascinating museum items. I feel an interest in Bishop Challoner, V.A. of the London District, partly because I have been able to say Mass from his Missal in the recusant Chapel at Milton Manor near Oxford, where Challoner liked to stay and where he was buried in the Squire's vault inside the Anglican Parish Church. (The prayer for his beatification is said after each Mass at Milton.)
Ware possesses the lead crucifix which was on his original coffin (before the poor fellow was exhumed and carted off to Westminster Cathedral). It has his splendid tall baroque mitre, exhibited beside a Puginesque Gothic mitre about a tenth of its height! And various other memorabilia.
* Yes; I think that is the correct, or historical, way of spelling Abingdon. I love this great Saint's festival in November, and enjoy visiting the Church there ... full of allusions to the Order of Malta.