The Capela dos Ossos (Chapel of Bones) in Évora, #Portugal. The words over the chapel entrance say "We bones that are here await yours." It is indeed a place for solemn contemplation of our mortality and the transient nature of existence. But I also found the place to be quite humerus.
Great Rift Valley is part of an intra-continental ridge system that runs through Kenya from north to south. It is part of the Gregory Rift, the eastern branch of the East African Rift, which starts in Tanzania to the south and continues northward into Ethiopia.
The Mau Escarpment is a fault scarp running along the western edge of the Great Rift Valley. The top of the escarpment reaches approximately 3000 m (10,000 ft) above sea level, and is over 1000 m higher than the floor of the Rift Valley.