The hamlet of Grumbla along with HIgher Grumbla, Lower Grumbla and Grumbla Common is a small area within the parish of Sancreed, to the west of Sancreed Beacon. Grumbla lies within the Cornwall Area of Outstanding Natural Beauty (AONB). Almost a third of Cornwall has AONB designation, with the same status and protection as a National Park.
The remains of a possible prehistoric tomb, or cromlech, after which Grumbla is named, can be found at grid reference . It consists of a circular earth bank lined with big stones, but its identification is uncertain and it could be the remains of a hut circle. There is slab of rock, 50 metres (160 ft) north of this (grid reference ), set on edge and apparently artificially erected, which could be the support of a dolmen, or the retaining circle of a barrow. Ramparts of the Iron Age hillfort of Caer Bran is 700 metres (2,300 ft) are to the south of the hamlet, and the Iron Age settlement of Carn Euny is about 900 metres (3,000 ft) to the south-west.
The leasehold tenement of ″Little Grumbler″ was put up for sale at the Bird-in-Hand Inn, Sancreed Churchtown on Friday, 14 May 1880. The tenement consisted of a dwellinghouse and approximately 6 acres 2 roods, 32 poles (about 2.5 ha) of arable and pasture land. It had previously been under an indenture of lease for an absolute term of 60 years commencing on 24 June 1845 and the yearly rent was £4 per annum. Captain T Trahair of St Just purchased the property for £1 more than the reserve price of £160.
- Pool, Peter A S. The Place-Names of West Penwith (Second ed.). Heamoor: Self published. p. 52.
- "Sancreed". The Cornishman (97). 20 May 1880. p. 4.
- Ordnance Survey: Landranger map sheet 203 Land's End & Isles of Scilly (Map). Ordnance Survey. 2009. ISBN 978-0-319-23289-7.
- "Grumbla". Explore Britain. Retrieved 18 November 2016.
- "Monument No. 422326". PastScape. Retrieved 18 November 2016.
- "Desirable Leasehold Tenement, In Sancreed, For Sale". The Cornishman (95). 6 May 1880. p. 1.