Lord William Northrop Macmillan: Man-Mountain
The cache, a small cylindrical plastic camo-container is hidden under a large rock at the Macmillan Grave site (to the south of his grave) about half way up the good (4WD) dirt track leading to the top of Ol Donyo Sabuk (Maasai: 'Big Mountain'). On a clear day there are great views from here and other viewpoints on the mountain. There are a series of transmission masts at the summit and it is possible to climb one of these for an even more stunning view - if you are up to it!
The mountain is within Ol Donyo Sabuk National Park so the relevant entry fees will be payable - check for details on the web. Opening hours are 06h00-19h00 daily.
To reach the cache location: Take the Garissa Road (A3) east from its Thika Road turn-off as far as the S 01 03.656 E 037 14.244 turn off for Ol Donyo Sabuk National Park and Kilima Mbogo. Follow this dirt road passing the turn off for 14 Falls then over the river bridge into Donyo Sabuk village. After passing through here take a right turn @ S 01 05.060 E 037 15.255 signposted to the National Park entrance gate. From here simply follow the road up the mountain . . .
Note: the given coordinates are taken from Google Earth where the grave site is clearly visible as the cloudy conditions on the day of placement adversely affected the GPS readings taken.
Lord William Northrup Macmillan (1872–1925), a huge, big-hearted, self-made millionaire, was literally a larger than life character!
Born and raised in St. Louis, Missouri, USA he first worked as a rancher in New Mexico, then became a businessman in St. Louis and later London before moving to Africa in 1901 where he was an explorer, big-game hunter and then again a rancher in British East Africa (Kenya).
Having explored and hunted in Sudan and Ethiopia, he came to Kenya in 1904 on a shooting trip, fell in love with the country, bought a large estate (Juja) and a mountain (Kilima Mbogo - kishahili for 'Buffalo Mountain' - or Ol Donyo Sabuk) and decided his future lay in helping 'opening up a completely new colony'.
He poured his large fortune and all his enthusiastic energies into his adopted country, developing his estates, backing new business ventures and 
providing assistance to the needy. During World War I, he became a British citizen and was knighted in 1918 for his wartime services as Captain of the 25th (Service) Battalion of the Royal Fusiliers (Frontiersmen). He played a huge role in helping to keep the protectorate under the British Regime.
Later he was elected as an honorary member of the Legislative Council, worked with Ewart Grogan and Lord Delamere, and funded various African training schemes. He was also a corresponding member of the Zoological Society and a fellow of the Royal Geographical Society. He was one of three or four settlers (like Delamere and Lord Egerton) who were influential in bringing agricultural science to Kenya, establishing agriculture as one of the country's major economies.
However although he got very involved in various agricultural pursuits being put forward at the time, he was not a very successful farmer - 'the anguish of his crushing failures to father children is equalled only by the indomitable spirit in which he took on one farming failure after the other'. He is remembered fondly in the area as a bit of a dreamer who engaged in many unsuccessful initiatives.
He was a huge man, about 7' tall with a 5' girth and weighed over 300 pounds and obviously stood out in a crowd! He was also very generous and his Juja hunting ranch and Chiromo (Nairobi) town house were known for lavish hospitality and helped set the fashion for safari tourism.
Macmillan’s Castle (the popular name for his Juja house) was known for its scandals, affairs and wife-swapping parties and nicknamed kilavu (club house) by the locals. He hosted former (26th) US President Theodore Roosevelt there several times - once as as he wrote his biography and also during his famous 1909 safari and other hunting trips. Winston Churchill was also a guest during his 1908 excursion to Uganda and Kenya as a travel writer producing Churchill - My African Journey, the story of his trip. It later became a popular film location.
His death in 1925 at the age of 53 robbed Kenya of one of its most colourful and influential pioneering settlers. When he died, having expressed the desire to be buried at the summit of his mountain which he loved so much, the hearse was fitted with skis and pulled up the mountain by a tractor followed by the mourners in cars. However so many clutches burnt out along the way up that he was buried about half-way up (the location of this cache). His wife Lucie, her maid Louise . . . and a family dog are also buried at the same site!
Apparently his family still wants to fulfil his wish although it would be a huge task now as the grave is encased in an enormous granite slab that thieves tried to vandalise believing he was buried with a lot of money. His tombstone has gone the servant’s tombstone is intact.
McMillan's widow, Lucie, built the McMillan Memorial Library in Nairobi in his memory in the early 1930s.
A recent new 'Northrup' by Judy Aldrick contains new information on the couple who have hitherto been shadowy characters in Kenya's colonial history.
MacMillan Castle is located at S 01 05.755 E 037 16.775. To reach here turn right (west) off the road running south from Donyo Sabuk @ S 01 05.495 E 037 16.632 to access the Castle where a small entry fee is payable - nothing inside the house but nice location with great views and lots of history which one of the guides should be able to provide.