The Festivals and their Meaning III: Ascension and Pentecost (Lectures Section)

In the Lectures Section of the Rudolf Steiner Archive: The Festivals and their Meaning III: Ascension and Pentecost, by Rudolf Steiner.
Link: http://wn.rudolfsteinerelib.org/Lectures/AscenPent/AscPen_index.html

The Education of the Child in the Light of Anthroposophy (Articles Section)

This essay on education gives in seed form what later became the Waldorf School movement. Originally published in the magazine Lucifer-Gnosis.
Link: http://wn.rudolfsteinerelib.org/Articles/EduChild/EduChi_index.html

Descriptive Sketches of the Spiritual World (Lectures Section)

Translated from notes of two lectures given at Bergen, Norway, 10th and 11th October, 1913, unrevised by the author. From the volume Occult Investigation of Life between Death and Rebirth).
Link: http://wn.rudolfsteinerelib.org/Lectures/DescSketch/DeSket_index.html

Foundations of Esotericism (Lectures Section)

In these lectures, Steiner speaks to a small group of active members of the Theosophical Society of Berlin. He presents a sweep of occult knowledge including the phases of planetary evolution, planetary influences, the kingdoms of nature, various myths and symbols, human physical and spiritual organs, illness, reincarnation, and much more. Included are unexpected insights into specific phenomena such as dinosaurs, bacteria, radiation, the Sphinx, and Freemasonry.
Link: http://wn.rudolfsteinerelib.org/Lectures/FoundEsoter/FndEso_index.html