In Europe, these underground vaults are sometimes called crypts or catacombs. EC cells are small polygonal cells located in the crypts between intestinal villi. The Romans (Byzantium) also suffered decades of theft and destruction of tombs, crypts, and graves. These cells were located between the crypts and villi. Tonsilloliths or tonsil stones are calcifications that form in the crypts of the palatal tonsils. The Sleeping Dead are apparently emerging from crypts or graves. They generally line the gastrointestinal tract, where they regulate the shapes of crypts and villi. The invaginations are called the intestinal glands or colonic crypts. The player encounters special rooms such as shops, crypts, and vaults. The socially prominent sometimes had the privilege of having their corpses stored in church crypts. The epithelial inner surface of the colon is punctuated by invaginations, the colonic crypts. They are also very common in palaces and crypts. The majority of mummies recovered in the Czech Republic come from underground crypts. The basement of the cathedral also hosts the Bishops, Provosts and Ducal crypts. Palatine tonsils consist of approximately 15 crypts, which result in a large internal surface.