SAMAADH
Samaadh (Smaadhi) is a memorial built over the ashes, or place of cremation, of some deceased person. It has the same importance among the Hindus as a tomb has for the Muslims.
In Sikhism, it is forbidden to build such a structure, mausoleum etc. Memorials, otherwise (not over the ashes or at the place of cremation) are not prohibited. All the Samaadhs, existing at present, those built by some Sikhs are in contravention of the teaching of Guru Granth Sahib.
(Dr Harjinder Singh Dilgeer)