Unable to answer "What kind of memorial is this?" – Old Dharahara Remains (Memorial) – node/3498367331 via StreetComplete 62.2:

Remains of the structure which was felled by the 2015 earthquake, the new one being constructed beside it.

Unable to answer "What are the opening hours here?" – Smiles For Miles (Cosmetics Store) – node/10013301543 via StreetComplete 61.0:

Despite the storefront signs being up, the shop has functionally been abandoned and is now used by the school as a storage room.