Katedrála Nanebevzetí Panny Marie

This church was built around 1300. It was built on the place of an older church and was a part of the Cistercians Sedlec Abbey, which was the oldest Cistercian abbey in the Czech lands founded in 1142.
The woman at the information building suggested we come here before going to the Sedlec Ossuary. She said this would be a small dose of what we could expect at the ossuary and might help ease into it.
She was right, I would advise starting here. There are parts of this church that were unearthed in a reconstruction that encased a number of bodies in the stones. Plus they have preserved «relics» or bones of a couple martyrs dressed to the nines – in gold and glass display coffins.
Once you get past that, the church is lovely. Definitely go upstairs and view the church from above. It is worth it. It won’t take too much of your day and it is a nice intro to the ossuary.
Once you get back to the main street from the ossuary, catch a bus into town and see St Barbara’s. It is an impressive church and grounds.
You can catch a little train in town back to the main train to return to Prague if that is the way you came (and I suggest it.) You can get tickets in advance to sit in assigned seating (advised if you don’t like meeting interesting people), or you can buy an open seat to come and go when it works for you. We didn’t check about open first class passage, but you might, especially if there are a number of you, though the train back to Prague in the evening was much more open than the full train to Kutna Hora that morning.